Accumulated Other Comprehensive Loss - Components of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 263,477
Other comprehensive income (loss)	(2,986)
Income taxes	1,223
Other expense, net	(4,348)	$ 1,833
Income taxes	3,924	$ 4,294
Ending Balance	267,134
Reclassification Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other expense, net	5,585
Income taxes	(2,123)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(5,115)
Other comprehensive income (loss)	234
Ending Balance	(4,881)
Debt Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(1,465)
Other comprehensive income (loss)	(3,220)
Income taxes	1,223
Debt Securities [Member] | Reclassification Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other expense, net	5,585
Income taxes	(2,123)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(6,580)
Ending Balance	$ (4,881)