Changes in Accumulated Other Comprehensive Loss, Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period, Pension and Postretirement Benefit Plans	$ (82,656)		$ (84,204)
Other comprehensive earnings, net of tax, Pension and Postretirement Benefit Plans	1,249		2,797
Balance at end of period, Pension and Postretirement Benefit Plans	(81,407)		(81,407)
Balance at beginning of period, Foreign Currency	5,275		5,076
Other comprehensive earnings, net of tax, Foreign Currency	(53)		146
Balance at end of period, Foreign Currency	5,222		5,222
Balance at beginning of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	(4,610)		(4,762)
Other comprehensive earnings, net of tax, Unamortized Value of Terminated Forward Starting Interest Rate Swap	155		307
Balance at end of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	(4,455)		(4,455)
Balance at beginning of period, Accumulated Other Comprehensive Loss	(81,991)		(83,890)
Other comprehensive earnings, net of tax, Accumulated Other Comprehensive Loss	1,351		3,256
Other comprehensive earnings, net of tax, Accumulated Other Comprehensive Loss	1,351	5,246	3,250	4,341
Balance at end of period, Accumulated Other Comprehensive Loss	$ (80,640)	$ (49,319)	$ (80,640)	$ (49,319)