Changes in Accumulated Other Comprehensive Earnings, Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (106,159)	$ (44,114)
Other comprehensive loss before reclassifications, net of tax	(2,288)	914
Amounts reclassified from accumulated other comprehensive loss, net of tax	1,724	456
Other comprehensive earnings (loss), net of tax	(564)	1,370
Balance at end of period	(106,723)	(42,744)
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(106,688)	(44,549)
Amounts reclassified from accumulated other comprehensive loss, net of tax	1,537	282
Other comprehensive earnings (loss), net of tax	1,537	282
Balance at end of period	(105,151)	(44,267)
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	3,278	3,902
Other comprehensive loss before reclassifications, net of tax	(2,288)	914
Other comprehensive earnings (loss), net of tax	(2,288)	914
Balance at end of period	990	4,816
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(2,749)	(3,467)
Amounts reclassified from accumulated other comprehensive loss, net of tax	187	174
Other comprehensive earnings (loss), net of tax	187	174
Balance at end of period	$ (2,562)	$ (3,293)