Accumulated Other Comprehensive Loss - Components of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ (6,232)
Unrealized gain on derivative instruments, net of tax	26	$ 665
Unrealized loss on debt securities, net of tax	(527)
Ending Balance	(5,512)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(4,389)
Foreign currency translation adjustment	1,221
Ending Balance	(3,168)
Change in Fair Value of Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	228
Unrealized gain on derivative instruments, net of tax	26
Ending Balance	254
Change in Fair Value of Debt Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(2,071)
Unrealized loss on debt securities, net of tax	(527)
Ending Balance	(2,598)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(6,232)
Unrealized gain on derivative instruments, net of tax	26
Unrealized loss on debt securities, net of tax	(527)
Foreign currency translation adjustment	1,221
Ending Balance	$ (5,512)