Changes in Accumulated Other Comprehensive Earnings, Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	$ (42,744)	$ (104,948)	$ (44,114)	$ (106,169)
Other comprehensive (loss) earnings before reclassifications, net of tax	416	(3,447)	1,326	(4,315)
Amounts reclassified from accumulated other comprehensive loss, net of tax	187	2,138	647	4,227
Other comprehensive earnings, net of tax	603	(1,309)	1,973	(88)
Balance at end of period	(42,141)	(106,257)	(42,141)	(106,257)
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(44,267)	(106,296)	(44,549)	(108,189)
Other comprehensive (loss) earnings before reclassifications, net of tax	(426)	(2,278)	(430)	(2,312)
Amounts reclassified from accumulated other comprehensive loss, net of tax	8	1,971	294	3,898
Other comprehensive earnings, net of tax	(418)	(307)	(136)	1,586
Balance at end of period	(44,685)	(106,603)	(44,685)	(106,603)
Foreign Currency
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	4,816	5,323	3,902	6,157
Other comprehensive (loss) earnings before reclassifications, net of tax	842	(1,169)	1,756	(2,003)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Other comprehensive earnings, net of tax	842	(1,169)	1,756	(2,003)
Balance at end of period	5,658	4,154	5,658	4,154
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(3,293)	(3,975)	(3,467)	(4,137)
Other comprehensive (loss) earnings before reclassifications, net of tax	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	179	167	353	329
Other comprehensive earnings, net of tax	179	167	353	329
Balance at end of period	$ (3,114)	$ (3,808)	$ (3,114)	$ (3,808)