Changes in Accumulated Other Comprehensive Loss by Component - Cumulative Other Comprehensive Loss in Accompanying Consolidated Statements of Equity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 979,248
Amortization of prior service credit	(566)	$ (566)	$ (566)
Amortization of actuarial losses	43,624	46,736	36,473
Pension settlement charges	12,262	0	0
Ending balance	1,076,014	979,248
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(22,034)	9,059
Other comprehensive (loss) income before reclassifications	(53,381)	(31,093)
Foreign currency translation effect	0	0
Income tax effect	0	0
Cash flow hedges	0	0
Amortization of prior service credit	0	0
Amortization of actuarial losses	0	0
Pension settlement charges	0
Income tax effect	0	0
Other comprehensive (loss) income	(53,381)	(31,093)
Ending balance	(75,415)	(22,034)	9,059
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	3,454	4,762
Other comprehensive (loss) income before reclassifications	(2,471)	11,127
Foreign currency translation effect	0	0
Income tax effect	941	(4,156)
Cash flow hedges	100	(13,446)
Amortization of prior service credit	0	0
Amortization of actuarial losses	0	0
Pension settlement charges	0
Income tax effect	(57)	5,167
Other comprehensive (loss) income	(1,487)	(1,308)
Ending balance	1,967	3,454	4,762
Post- retirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(491,187)	(544,423)
Other comprehensive (loss) income before reclassifications	(39,689)	23,597
Foreign currency translation effect	13,152	6,879
Income tax effect	10,770	(7,213)
Cash flow hedges	0	0
Amortization of prior service credit	(566)	(566)
Amortization of actuarial losses	43,624	46,736
Pension settlement charges	12,262
Income tax effect	(20,069)	(16,197)
Other comprehensive (loss) income	19,484	53,236
Ending balance	(471,703)	(491,187)	(544,423)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(509,767)	(530,602)
Other comprehensive (loss) income before reclassifications	(95,541)	3,631
Foreign currency translation effect	13,152	6,879
Income tax effect	11,711	(11,369)
Cash flow hedges	100	(13,446)
Amortization of prior service credit	(566)	(566)
Amortization of actuarial losses	43,624	46,736
Pension settlement charges	12,262
Income tax effect	(20,126)	(11,030)
Other comprehensive (loss) income	(35,384)	20,835
Ending balance	$ (545,151)	$ (509,767)	$ (530,602)