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Schedule of Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Components Of Other Comprehensive Income Loss [Line Items]        
Foreign currency translation adjustment $ 5,770 $ 1,193 $ 7,925 $ 14,886
Unrealized gain (loss) on cash flow hedging instruments 304 (1,483) (119) (2,569)
Income tax (expense) benefit (82) 401 32 694
Unrealized gain (loss) on cash flow hedging instruments, net of tax 222 (1,082) (87) (1,875)
Reclassification of (gain) loss on cash flow hedging instruments into earnings (937) 1,611 (1,180) 545
Income tax expense (benefit) 254 (435) 319 (147)
Reclassification of (gain) loss on cash flow hedging instruments into earnings, net of tax (683) 1,176 (861) 398
Unrealized (loss) gain on available-for-sale securities (8) (28) 5 (15)
Income tax benefit (expense) 3 10 (2) 6
Unrealized (loss) gain on available-for-sale securities, net of tax (5) (18) 3 (9)
Other comprehensive income $ 5,304 $ 1,269 $ 6,980 $ 13,400