Amounts Included in Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			$ (223,856)
Other comprehensive income before reclassifications			37,534
Amounts reclassified from accumulated other comprehensive loss			1,183
Other comprehensive income	$ 30,971	$ (4,840)	38,717	$ 6,510
Balance at June 30, 2017	(185,139)	$ (202,296)	(185,139)	$ (202,296)
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			0
Amounts reclassified from accumulated other comprehensive loss			1,258
Other comprehensive income			1,258
Balance at June 30, 2017	(81,847)		(81,847)
Change in Fair Value of Derivatives [Member]
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			540
Other comprehensive income before reclassifications			(400)
Amounts reclassified from accumulated other comprehensive loss			(75)
Other comprehensive income			(475)
Balance at June 30, 2017	65		65
Foreign Currency Translation [Member]
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			(141,291)
Other comprehensive income before reclassifications			37,934
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income			37,934
Balance at June 30, 2017	$ (103,357)		$ (103,357)