Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Losses) (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]
Beginning Balance	$ (173,068)	$ (69,366)	$ (154,870)	$ (75,357)
Other comprehensive income before reclassifications (net of tax)	(4,643)	(32,071)	(27,102)	(31,661)
Amounts reclassified from accumulated other comprehensive income (net of tax)	1,641	2,494	5,902	8,075
Other comprehensive loss	(3,002)	(29,577)	(21,200)	(23,586)
Ending Balance	(176,070)	(98,943)	(176,070)	(98,943)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(58,857)	15,336	(34,224)	15,141
Other comprehensive income before reclassifications (net of tax)	(3,262)	(33,450)	(27,895)	(33,255)
Other comprehensive loss	(3,262)	(33,450)	(27,895)	(33,255)
Ending Balance	(62,119)	(18,114)	(62,119)	(18,114)
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,621	60	2,356	(941)
Other comprehensive income before reclassifications (net of tax)	(1,381)	1,379	793	1,594
Amounts reclassified from accumulated other comprehensive income (net of tax)	(1,442)	96	(3,351)	882
Other comprehensive loss	(2,823)	1,475	(2,558)	2,476
Ending Balance	(202)	1,535	(202)	1,535
Change in Pensions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(114,076)	(84,822)	(120,260)	(89,547)
Amounts reclassified from accumulated other comprehensive income (net of tax)	3,090	2,363	9,274	7,088
Other comprehensive loss	3,090	2,363	9,274	7,088
Ending Balance	(110,986)	(82,459)	(110,986)	(82,459)
Change in Other Postretirement Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,756)	60	(2,742)	(10)
Amounts reclassified from accumulated other comprehensive income (net of tax)	(7)	35	(21)	105
Other comprehensive loss	(7)	35	(21)	105
Ending Balance	$ (2,763)	$ 95	$ (2,763)	$ 95