Amounts Included in Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			$ (223,856)
Other comprehensive income before reclassifications			52,046
Amounts reclassified from accumulated other comprehensive loss			1,547
Other comprehensive income	$ 14,876	$ 7,034	53,593	$ 13,544
Balance at September 30, 2017	(170,263)	$ (195,262)	(170,263)	$ (195,262)
Unrecognized Net Defined Benefit Plan Costs [Member]
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			(83,105)
Other comprehensive income before reclassifications			172
Amounts reclassified from accumulated other comprehensive loss			1,644
Other comprehensive income			1,816
Balance at September 30, 2017	(81,289)		(81,289)
Change in Fair Value of Derivatives [Member]
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			540
Other comprehensive income before reclassifications			(429)
Amounts reclassified from accumulated other comprehensive loss			(97)
Other comprehensive income			(526)
Balance at September 30, 2017	14		14
Foreign Currency Translation [Member]
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			(141,291)
Other comprehensive income before reclassifications			52,303
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income			52,303
Balance at September 30, 2017	$ (88,988)		$ (88,988)