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Changes in Goodwill (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]    
Opening balance $ 1,038,346 $ 1,057,214
Goodwill relating to acquisitions consummated during the period 14,479 7,674
Impact of measurement period adjustments   (135)
Effect of exchange rate fluctuations 2,912 (26,407)
Closing balance $ 1,055,737 $ 1,038,346