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Fair Value Measurement (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability     $ (11,206) $ (425) $ (5,576)
Business Acquisition, Contingent Consideration, Actual Cash Payment $ 2,741 $ 3,482 4,618    
Provision for Doubtful Accounts     $ 5,470 $ 0 $ 0