Changes in Accumulated Other Comprehensive Earnings Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	$ (106,258)	$ (80,640)	$ (106,169)	$ (83,890)
Other comprehensive (loss) earnings before reclassifications, net of tax	993	1,552	(3,323)	1,232
Amounts reclassified from accumulated other comprehensive loss, net of tax	2,555	1,608	6,782	5,178
Other comprehensive earnings (loss), net of tax	3,548	3,160	3,459	6,410
Balance at end of period	(102,710)	(77,480)	(102,710)	(77,480)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(106,603)	(81,407)	(108,189)	(84,204)
Other comprehensive (loss) earnings before reclassifications, net of tax		117	(2,312)	(349)
Amounts reclassified from accumulated other comprehensive loss, net of tax	2,387	1,451	6,285	4,714
Other comprehensive earnings (loss), net of tax	2,387	1,568	3,973	4,365
Balance at end of period	(104,216)	(79,839)	(104,216)	(79,839)
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	4,153	5,222	6,157	5,076
Other comprehensive (loss) earnings before reclassifications, net of tax	993	1,435	(1,011)	1,581
Other comprehensive earnings (loss), net of tax	993	1,435	(1,011)	1,581
Balance at end of period	5,146	6,657	5,146	6,657
Accumulated Net Gain Loss From Terminated Forward Starting Interest Rate Swap
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(3,808)	(4,455)	(4,137)	(4,762)
Amounts reclassified from accumulated other comprehensive loss, net of tax	168	157	497	464
Other comprehensive earnings (loss), net of tax	168	157	497	464
Balance at end of period	$ (3,640)	$ (4,298)	$ (3,640)	$ (4,298)