Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 893,654	$ 874,475
Pre-tax amount	(3,223)	9,708
Tax (provision) benefit	12	(71)
Reclassification of (gain) loss to net income	1,424	(3,635)
Ending Balance	944,643	893,654
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(40,450)	(52,749)
Pre-tax amount	(2,927)	12,461
Foreign currency translation	(25)	(162)
Ending Balance	(43,402)	(40,450)
Unrealized Gain (Loss) on Net Investment Hedge [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	1,046	1,046
Ending Balance	1,046	1,046
Unrealized Gain (Loss) on Cash Flow Hedging Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,191)	2,290
Pre-tax amount	(296)	(839)
Tax (provision) benefit	11	(253)
Reclassification of (gain) loss to net income	1,428	(3,418)
Foreign currency translation	34	29
Ending Balance	(1,014)	(2,191)
Unrealized Actuarial Gain (Loss) Related to Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	596	2,324
Pre-tax amount		(1,914)
Tax (provision) benefit	1	182
Reclassification of (gain) loss to net income	(4)	(129)
Foreign currency translation	(9)	133
Ending Balance	584	596
Unrealized Gain (Loss) on Postretirement Obligation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		88
Reclassification of (gain) loss to net income		(88)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(40,999)	(47,001)
Ending Balance	$ (42,786)	$ (40,999)