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Acquisitions and divestitures - Reconciliation of Changes in Contingent Earn-Out Obligations (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Contingent Earn-Out Obligations [Roll Forward] |
Beginning balance | $ 6,388
Contingent earn-out obligations associated with acquisitions | (1,246)
Remeasurement of fair value for contingent earn-out obligations | (401)
Ending balance | $ 7,233

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