Amounts Included in Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2017	$ (188,973)
Other comprehensive income before reclassifications	13,434
Amounts reclassified from accumulated other comprehensive loss	832
Other comprehensive income	14,266	$ 7,746
Balance at March 31, 2018	(174,707)	$ (216,110)
Unrecognized Net Defined Benefit Plan Costs [Member]
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2017	(104,822)
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive loss	856
Other comprehensive income	856
Balance at March 31, 2018	(103,966)
Change in Fair Value of Derivatives [Member]
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2017	(89)
Other comprehensive income before reclassifications	(366)
Amounts reclassified from accumulated other comprehensive loss	(24)
Other comprehensive income	(390)
Balance at March 31, 2018	(479)
Foreign Currency Translation [Member]
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2017	(84,062)
Other comprehensive income before reclassifications	13,800
Amounts reclassified from accumulated other comprehensive loss	0
Other comprehensive income	13,800
Balance at March 31, 2018	$ (70,262)