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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				$ 556,984
Other comprehensive income before reclassifications		$ (2,211)	$ (19,766)	7,688	$ (38,990)
Amounts reclassified from AOCI	[1]	499	724	1,633	2,224
Net current-period other comprehensive income		(1,712)	(19,042)	9,321	(36,766)
Ending Balance		638,356		638,356
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(78,406)	(62,111)	(88,337)	(42,914)
Other comprehensive income before reclassifications		(2,209)	(19,750)	7,722	(38,947)
Net current-period other comprehensive income		(2,209)	(19,750)	7,722	(38,947)
Ending Balance		(80,615)	(81,861)	(80,615)	(81,861)
Defined Benefit Pension Plan Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(35,696)	(39,650)	(36,825)	(41,149)
Amounts reclassified from AOCI		497	722	1,626	2,221
Net current-period other comprehensive income		497	722	1,626	2,221
Ending Balance		(35,199)	(38,928)	(35,199)	(38,928)
Cash Flow Hedge Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		47	92	74	118
Other comprehensive income before reclassifications		(2)	(16)	(34)	(43)
Amounts reclassified from AOCI		2	2	7	3
Net current-period other comprehensive income			(14)	(27)	(40)
Ending Balance		47	78	47	78
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(114,055)	(101,669)	(125,088)	(83,945)
Ending Balance		$ (115,767)	$ (120,711)	$ (115,767)	$ (120,711)

[1] Amounts in parentheses denote expense to statement of income.