Changes in Accumulated Other Comprehensive Earnings (Loss), Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (105,622)	$ (106,159)
Other comprehensive earnings (loss) before reclassifications, net of tax	115	(2,288)
Amounts reclassified from accumulated other comprehensive earnings, net of tax	1,674	1,724
Other comprehensive earnings (loss), net of tax	1,789	(564)
Balance at end of period	(103,833)	(106,723)
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(103,380)	(106,688)
Amounts reclassified from accumulated other comprehensive earnings, net of tax	1,473	1,537
Other comprehensive earnings (loss), net of tax	1,473	1,537
Balance at end of period	(101,907)	(105,151)
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(264)	3,278
Other comprehensive earnings (loss) before reclassifications, net of tax	115	(2,288)
Other comprehensive earnings (loss), net of tax	115	(2,288)
Balance at end of period	(149)	990
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(1,978)	(2,749)
Amounts reclassified from accumulated other comprehensive earnings, net of tax	201	187
Other comprehensive earnings (loss), net of tax	201	187
Balance at end of period	$ (1,777)	$ (2,562)