Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Summary of Purchase Consideration (Detail)

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Acquisitions - Summary of Purchase Consideration (Detail) - Jamison - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Mar. 30, 2015
Sep. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Cash paid on date of acquisition $ 3,550    
Notes payable to Jamison and Principals of Jamison 2,165    
Units issued 3,562    
Contingent consideration 1,429 $ 1,162 $ 1,342
Total purchase consideration $ 10,706