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Acquisitions and divestitures - Reconciliation of Changes in Contingent Earn-Out Obligations (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Contingent Earn-Out Obligations [Roll Forward]  
Beginning balance $ 6,388
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (1,436)
Remeasurement of fair value for contingent earn-out obligations (335)
Ending balance $ 7,489