Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning Balance			$ (217,065)
Ending Balance	$ (210,141)		(210,141)
Cumulative currency translation adjustment [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning Balance	(112,395)	$ (99,541)	(130,660)	$ (50,371)
Other comprehensive income (loss) before reclassifications	(8,385)	7,177	9,880	(40,384)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	(1,609)
Ending Balance	(120,780)	(92,364)	(120,780)	(92,364)
Benefit plan liabilities [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning Balance	(85,848)	(81,100)	(84,124)	(86,861)
Other comprehensive income (loss) before reclassifications	928	(1,355)	(1,142)	4,021
Amounts reclassified from accumulated other comprehensive income (loss)	325	415	671	800
Ending Balance	(84,595)	(82,040)	(84,595)	(82,040)
Fair value change of derivatives [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning Balance	(4,355)	(2,595)	(2,281)	(2,011)
Other comprehensive income (loss) before reclassifications	(1,883)	(436)	(4,630)	(1,119)
Amounts reclassified from accumulated other comprehensive income (loss)	1,472	89	2,145	188
Ending Balance	(4,766)	(2,942)	(4,766)	(2,942)
Accumulated other comprehensive loss [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning Balance	(202,598)	(183,236)	(217,065)	(139,243)
Other comprehensive income (loss) before reclassifications	(9,340)	5,386	4,108	(37,482)
Amounts reclassified from accumulated other comprehensive income (loss)	1,797	504	2,816	(621)
Ending Balance	$ (210,141)	$ (177,346)	$ (210,141)	$ (177,346)