Quarterly report pursuant to Section 13 or 15(d)

Equity-Based Compensation - Additional Information (Detail)

v3.3.0.814
Equity-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Nov. 02, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Equity program, description       The Deferred Equity Unit represents the unsecured right to receive one unit of SLP or the equivalent cash value of up to 50% (or such other percentage as may be determined by the Company’s Executive Committee) of SLP’s units issuable upon the vesting of any such Deferred Equity Units and the remaining 50% in units upon the vesting of any such Deferred Equity Units.        
Performance Unit, description       The Performance Unit represents the unsecured right to receive one unit of SLP for every two units of SLP issuable upon the vesting of any such Deferred Equity Units.        
Equity-based compensation   $ 497 $ 74 $ 716 $ 848      
Cash distributions on awards   0 0          
Unrecognized compensation expense related to unvested awards   $ 35   $ 35   $ 168    
Recognition period of unrecognized compensation expense related to unvested awards       4 months 21 days   7 months 24 days    
Estimated percentage of awards to be forfeited       10.00%        
Estimated service period       4 years        
2012 Equity Incentive Plan                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Shares reserved for issuance   704,450   704,450        
Shares reserved for issuance, authorized               1,687,500
Restricted stock units granted description       Twenty-five percent of the restricted stock units granted vest and settle on each of the first, second, third and fourth anniversaries of the grant date.        
Restricted stock units granted 966,510              
Fair value granted restricted stock unit per share $ 13.23              
2012 Equity Incentive Plan | First Anniversary                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Restricted stock, vesting percentage 25.00%              
2012 Equity Incentive Plan | Second Anniversary                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Restricted stock, vesting percentage 25.00%              
2012 Equity Incentive Plan | Third Anniversary                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Restricted stock, vesting percentage 25.00%              
2012 Equity Incentive Plan | Fourth Anniversary                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Restricted stock, vesting percentage 25.00%              
Deferred Compensation Share Based Payments                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Equity-based compensation   $ 12 74 $ 232 848      
Cash distributions on awards       0 1      
Vested awards settled in cash       0 30      
Performance Units                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Equity-based compensation   $ 2 $ 22 $ 80 $ 87      
Fair value granted restricted stock unit per share   $ 3.75 $ 3.75 $ 3.75 $ 3.75 $ 3.75 $ 3.75  
Performance Units | Deferred Compensation Share Based Payments                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Equity-based compensation   $ 2 $ 22 $ 80 $ 87      
Restricted Stock Units                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Equity-based compensation   484   484        
Unrecognized compensation expense related to unvested awards   $ 12,174   $ 12,174        
Recognition period of unrecognized compensation expense related to unvested awards       3 years 10 months 6 days        
Restricted stock units granted       966,510        
Fair value granted restricted stock unit per share   $ 13.23   $ 13.23