Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 10,313	$ 6,518
Other comprehensive income (loss), net of taxes:
Foreign currency translation gain (loss), net of taxes	(5,559)	(5,728)
Unrealized gain (loss) on net investment hedge, net of taxes	35	282
Unrealized actuarial gain (loss) related to pension liability, net of taxes	(21)	(8)
Unrealized gain (loss) on cash flow hedging instruments, net of taxes	(2,742)	2,019
Unrealized gain (loss) on postretirement obligation, net of taxes	6	(43)
Other comprehensive income (loss), net of taxes	(8,281)	(3,478)
Comprehensive income (loss)	$ 2,032	$ 3,040