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Fair Value Measurements - Reconciliation of Level 3 Liabilities (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Change in the estimated fair value of the contingent purchase price consideration $ (19) $ 5,497 $ (132) $ 5,327 $ 5,047 $ 509 $ 170
Unobservable Inputs (Level 3)              
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Beginning Balance Liabilities     1,095 $ 6,142 6,142 6,651  
Change in the estimated fair value of the contingent purchase price consideration     132   (5,047) (509)  
Ending Balance Liabilities $ 1,227   $ 1,227   $ 1,095 $ 6,142 $ 6,651