Shareholders' Equity Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2015	$ (62,492)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1,359)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	9,866	$ (30,156)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	4,040
Balance as of March 31, 2016	(59,811)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2015	(64,360)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	9,866
Balance as of March 31, 2016	(54,494)
Cash Flow Hedging | Foreign Exchange Contract
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2015	1,868
Reclassification to the income statement	(1,359)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(5,826)
Balance as of March 31, 2016	$ (5,317)