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Fair Value Measurements - Change in Level 3 Fair Values of Contingent Purchase Price Liabilities (Detail) - Contingent Purchase Price Liabilities [Member] - Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ (39,708) $ (37,574)
Additions from business acquisitions (1,806) (8,320)
Settlement of contingent purchase price liabilities 3,685 2,879
Change in fair value of contingencies 502 (1,370)
Change in net present value of contingencies (221) (239)
Ending balance $ (37,548) $ (44,624)