Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Additional Information (Detail)

v3.20.1
Acquisitions - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jul. 01, 2019
Apr. 12, 2019
Dec. 13, 2018
Dec. 15, 2015
Mar. 30, 2015
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Business Acquisition [Line Items]                
Revenue           $ 28,365,000 $ 22,572,000  
Income before provision for income taxes           12,436,000 4,068,000  
Contingent purchase price payment           413,000 425,000  
Cortina Asset Management, LLC                
Business Acquisition [Line Items]                
Aggregate purchase amount           57,824,000    
Equity consideration for SLP acquired           8,000,000   $ 14,000,000
Fair value adjustments to contingent purchase price consideration           (6,000,000)    
Revenue           2,851,000    
Income before provision for income taxes           1,096,000    
Cash paid on date of acquisition           17,072,000    
Cortina Asset Management, LLC | General, Administrative and Other                
Business Acquisition [Line Items]                
Costs related to acquisition           72,000    
Cortina Asset Management, LLC | Purchase Agreement                
Business Acquisition [Line Items]                
Aggregate purchase amount $ 33,577,000              
Percentage to acquire business in cash   80.00%            
Additional percentage to acquire business in cash 80.00% 80.00%            
Business combination consideration partially offset by net closing credits $ 35,072,000              
Equity consideration for SLP acquired 13,800,000              
Business combination acquired revenue   $ 13,027,000            
Cortina Asset Management, LLC | Purchase Agreement | Revenue Greater than or Equal to 95% for July 1, 2020 to June 30, 2021                
Business Acquisition [Line Items]                
Business combination contingent consideration first retention payment   3,370,000            
Cortina Asset Management, LLC | Purchase Agreement | Revenue Equal to 75% or Less for July 1, 2020 to June 30, 2021                
Business Acquisition [Line Items]                
Business combination contingent consideration first retention payment   0            
Cortina Asset Management, LLC | Purchase Agreement | Revenue Between 75% and 95% for July 1, 2020 to June 30, 2021                
Business Acquisition [Line Items]                
Business combination contingent consideration first retention payment, minimum   0            
Business combination contingent consideration first retention payment, maximum   3,370,000            
Cortina Asset Management, LLC | Purchase Agreement | Revenue Between 85% and 105% for July 1, 2021 to June 30, 2022                
Business Acquisition [Line Items]                
Business combination contingent consideration second retention payment, minimum   0            
Business combination contingent consideration second retention payment, maximum   5,617,000            
Cortina Asset Management, LLC | Purchase Agreement | Revenue Equal to 85% or Less for July 1, 2021 to June 30, 2022                
Business Acquisition [Line Items]                
Business combination contingent consideration second retention payment   0            
Cortina Asset Management, LLC | Purchase Agreement | Revenue Between 95% and 140% for July 1, 2022 to June 30, 2023                
Business Acquisition [Line Items]                
Business combination contingent consideration growth payment, minimum   0            
Business combination contingent consideration growth payment, maximum   17,222,000            
Cortina Asset Management, LLC | Purchase Agreement | Revenue Equal to 95% or Less for July 1, 2022 to June 30, 2023                
Business Acquisition [Line Items]                
Business combination contingent consideration growth payment   0            
Cortina Asset Management, LLC | Purchase Agreement | Maximum                
Business Acquisition [Line Items]                
Aggregate purchase amount   44,937,000            
Additional aggregate purchase amount 26,209,000 26,209,000            
Cortina Asset Management, LLC | Purchase Agreement | Maximum | Revenue Between 85% and 105% for July 1, 2021 to June 30, 2022                
Business Acquisition [Line Items]                
Business combination contingent consideration second retention payment   5,617,000            
Cortina Asset Management, LLC | Purchase Agreement | Maximum | Revenue Between 95% and 140% for July 1, 2022 to June 30, 2023                
Business Acquisition [Line Items]                
Business combination contingent consideration growth payment   $ 17,222,000            
Cortina Asset Management, LLC | Purchase Agreement | SLP                
Business Acquisition [Line Items]                
Percentage of business combination consideration issuance   20.00%            
Additional aggregate purchase amount $ 8,952,000              
Additional percentage of earn out payment paid in cash 20.00% 20.00%            
Potential earn-out payments period 4 years 4 years            
Issuance of Class B shares, Shares 662,713              
Neosho                
Business Acquisition [Line Items]                
Equity consideration for SLP acquired     $ 20,000     1,103,000   1,403,000
Cash paid on date of acquisition     399,000       399,000  
Contingent consideration     1,686,000          
Expected payments on first anniversary of closing date     300,000          
Earn out payments due in two years     100,000          
Earn out payments due in three years     100,000          
Earn out payments due in four years     100,000          
Earn out payments due in five years     $ 100,000          
Percentage of product to obtain earn out payment     50.00%          
Percentage of earn out payment paid in cash     75.00%          
Percentage of earn out payment paid in equity     25.00%          
Contingent purchase price payment           300,000    
Cappiccille                
Business Acquisition [Line Items]                
Equity consideration for SLP acquired           70,000   101,000
Fair value adjustments to contingent purchase price consideration           83,000    
Contingent consideration       $ 354,000        
Contingent purchase price payment           113,000 105,000  
Cash paid on date of acquisition       $ 148,000        
Earn out payments percentage on revenue remainder of fiscal year       19.00%        
Earn out payments percentage on revenue due in two years       19.00%        
Earn out payments percentage on revenue due in three years       19.00%        
Earn out payments percentage on revenue due in four years       19.00%        
Earn out payments percentage on revenue due thereafter       19.00%        
Jamison                
Business Acquisition [Line Items]                
Equity consideration for SLP acquired         $ 3,562,000      
Contingent consideration         1,429,000 418,000   $ 418,000
Contingent purchase price payment           $ 0 $ 320,000  
Cash paid on date of acquisition         $ 3,550,000      
Earn out payments percentage on EBITDA remainder of fiscal year         20.00%      
Earn out payments percentage on EBITDA due in two years         20.00%      
Earn out payments percentage on EBITDA due in three years         20.00%      
Earn out payments percentage on EBITDA due in four years         20.00%      
Earn out payments percentage on EBITDA due in five years         20.00%      
Earn Out Payments Percentage On EBITDA Due thereafter         20.00%      
Jamison | Seller Note                
Business Acquisition [Line Items]                
Promissory note issued         $ 394,000      
Interest on principal amount         5.00%      
Jamison | Principals Notes                
Business Acquisition [Line Items]                
Promissory note issued         $ 1,771,000      
Interest on principal amount         5.00%