Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), beginning balance	$ (29,528)	$ (38,250)	$ (41,485)
Other comprehensive income before reclassifications	(56,129)	5,300	929
Amounts reclassified from AOCI	1,712	3,422	2,306
Net current period other comprehensive income	(54,417)	8,722	3,235
Accumulated Other Comprehensive Income (Loss), ending balance	(83,945)	(29,528)	(38,250)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), beginning balance	(10,971)	(2,886)	(9,086)
Other comprehensive income before reclassifications	(31,943)	(8,085)	6,200
Net current period other comprehensive income	(31,943)	(8,085)	6,200
Accumulated Other Comprehensive Income (Loss), ending balance	(42,914)	(10,971)	(2,886)
Defined Benefit Pension Plan Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), beginning balance	(18,672)	(35,498)	(32,398)
Other comprehensive income before reclassifications	(24,186)	13,417	(5,387)
Amounts reclassified from AOCI	1,709	3,409	2,287
Net current period other comprehensive income	(22,477)	16,826	(3,100)
Accumulated Other Comprehensive Income (Loss), ending balance	(41,149)	(18,672)	(35,498)
Cash Flow Hedge Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), beginning balance	115	134	(1)
Other comprehensive income before reclassifications		(32)	116
Amounts reclassified from AOCI	3	13	19
Net current period other comprehensive income	3	(19)	135
Accumulated Other Comprehensive Income (Loss), ending balance	$ 118	$ 115	$ 134