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Fair Value Measurements - Change in Level 3 Fair Values of Contingent Purchase Price Liabilities (Detail) - Level 3 [Member] - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ (24,817)  
Ending balance (32,948)  
Contingent Purchase Price Liabilities [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance (24,817) $ (33,368)
Additions from business acquisitions (15,088) (4,186)
Settlement of contingent purchase price liabilities 6,349 5,622
Change in fair value of contingencies 714 1,400
Change in net present value of contingencies (106) (79)
Ending balance $ (32,948) $ (30,611)