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Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Business Combinations [Abstract] |  |
Document Period End Date | Mar. 31, 2019 |
Beginning balance | $ 89,924 | $ 36,175
Additions to estimated acquisition earn-out payables | 18,155 | 4,524
Payments for estimated acquisition earn-out payables | (579) | (2,565)
Subtotal | 107,500 | 38,134
Net change in earnings from estimated acquisition earn-out payables: |  |
Change in fair value on estimated acquisition earn-out payables | 50 | 2,062
Interest expense accretion | 1,160 | 404
Net change in earnings from estimated acquisition earn-out payables | 1,210 | 2,466
Ending balance | $ 108,710 | $ 40,600

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