Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), beginning balance	$ (101,669)	$ (24,845)	$ (83,945)	$ (29,528)
Other comprehensive income before reclassifications	(19,766)	(19,546)	(38,990)	(15,687)
Amounts reclassified from AOCI	724	431	2,224	1,255
Net current-period other comprehensive income	(19,042)	(19,115)	(36,766)	(14,432)
Accumulated Other Comprehensive Income (Loss), ending balance	(120,711)	(43,960)	(120,711)	(43,960)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), beginning balance	(62,111)	(7,112)	(42,914)	(10,971)
Other comprehensive income before reclassifications	(19,750)	(19,546)	(38,947)	(15,687)
Net current-period other comprehensive income	(19,750)	(19,546)	(38,947)	(15,687)
Accumulated Other Comprehensive Income (Loss), ending balance	(81,861)	(26,658)	(81,861)	(26,658)
Defined Benefit Pension Plan Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), beginning balance	(39,650)	(17,852)	(41,149)	(18,672)
Amounts reclassified from AOCI	722	429	2,221	1,249
Net current-period other comprehensive income	722	429	2,221	1,249
Accumulated Other Comprehensive Income (Loss), ending balance	(38,928)	(17,423)	(38,928)	(17,423)
Cash Flow Hedge Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), beginning balance	92	119	118	115
Other comprehensive income before reclassifications	(16)		(43)
Amounts reclassified from AOCI	2	2	3	6
Net current-period other comprehensive income	(14)	2	(40)	6
Accumulated Other Comprehensive Income (Loss), ending balance	$ 78	$ 121	$ 78	$ 121