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Reconciliation of Changes in Contingent Earn-Out Obligations (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 USD ($)
Contingent Earn-Out Obligations [Roll Forward] |
Beginning balance, January 1, 2017 | $ 9,977
Contingent earn-out obligations associated with acquisitions | 3,849
Remeasurement of fair value for contingent earn-out obligations | 415
Payments on contingent earn-out obligations | (2,567)
Ending balance | $ 11,674

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