Changes in Accumulated Other Comprehensive Earnings, Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	$ (42,141)	$ (106,258)	$ (44,114)	$ (106,169)
Other comprehensive (loss) earnings before reclassifications, net of tax	(1,466)	993	(141)	(3,323)
Amounts reclassified from accumulated other comprehensive loss, net of tax	326	2,555	974	6,782
Other comprehensive earnings (loss), net of tax	(1,140)	3,548	833	3,459
Balance at end of period	(43,281)	(102,710)	(43,281)	(102,710)
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(44,685)	(106,603)	(44,549)	(108,189)
Other comprehensive (loss) earnings before reclassifications, net of tax			(431)	(2,312)
Amounts reclassified from accumulated other comprehensive loss, net of tax	146	2,387	441	6,285
Other comprehensive earnings (loss), net of tax	146	2,387	10	3,973
Balance at end of period	(44,539)	(104,216)	(44,539)	(104,216)
Foreign Currency
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	5,658	4,153	3,902	6,157
Other comprehensive (loss) earnings before reclassifications, net of tax	(1,466)	993	290	(1,011)
Other comprehensive earnings (loss), net of tax	(1,466)	993	290	(1,011)
Balance at end of period	4,192	5,146	4,192	5,146
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(3,114)	(3,808)	(3,467)	(4,137)
Amounts reclassified from accumulated other comprehensive loss, net of tax	180	168	533	497
Other comprehensive earnings (loss), net of tax	180	168	533	497
Balance at end of period	$ (2,934)	$ (3,640)	$ (2,934)	$ (3,640)