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Schedule of Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Components Of Other Comprehensive Income Loss [Line Items]    
Foreign currency translation adjustment $ 2,155 $ 13,693
Unrealized loss on cash flow hedging instruments (423) (1,086)
Income tax benefit 114 293
Unrealized loss on cash flow hedging instruments, net of tax (309) (793)
Reclassification of gain on cash flow hedging instruments into earnings (243) (1,066)
Income tax expense 65 288
Reclassification of gain on cash flow hedging instruments into earnings, net of tax (178) (778)
Unrealized gain on available-for-sale securities 13 13
Income tax expense (5) (4)
Unrealized gain on available-for-sale securities, net of tax 8 9
Other comprehensive income $ 1,676 $ 12,131