Changes in Accumulated Other Comprehensive Loss, Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period, Pension and Postretirement Benefit Plans	$ (81,407)		$ (84,204)
Other comprehensive earnings, net of tax, Pension and Postretirement Benefit Plans	1,568		4,365
Balance at end of period, Pension and Postretirement Benefit Plans	(79,839)		(79,839)
Balance at beginning of period, Foreign Currency	5,222		5,076
Other comprehensive earnings, net of tax, Foreign Currency	1,435		1,581
Balance at end of period, Foreign Currency	6,657		6,657
Balance at beginning of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	(4,455)		(4,762)
Other comprehensive earnings, net of tax, Unamortized Value of Terminated Forward Starting Interest Rate Swap	157		464
Balance at end of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	(4,298)		(4,298)
Balance at beginning of period, Accumulated Other Comprehensive Loss	(80,640)		(83,890)
Other comprehensive earnings, net of tax, Accumulated Other Comprehensive Loss	3,160		6,420
Other comprehensive earnings, net of tax, Accumulated Other Comprehensive Loss	3,160	(240)	6,410	4,100
Balance at end of period, Accumulated Other Comprehensive Loss	$ (77,480)	$ (49,560)	$ (77,480)	$ (49,560)