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Goodwill (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Goodwill [Line Items]    
Opening balance $ 588,434 [1] $ 463,324
Current period acquisitions (Note 3) 39,376 133,123
Prior period acquisitions (Note 3) 5,403 4,418
Foreign exchange movement (6,556) (12,431)
Closing balance $ 626,657 $ 588,434 [1]
[1] The December 31, 2015 Balance Sheet has been retrospectively restated as required to reflect the requirements of new guidance in respect of the presentation of debt issue costs.