Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, Foreign currency items	$ (2,238)	[1]	$ (2,148)	[1]
Other comprehensive income before reclassification adjustments, Foreign currency items	70	[1]	393	[1]
Amounts reclassified from accumulated other comprehensive loss, Foreign currency items		[1]		[1]
Net current period other comprehensive income, Foreign currency items	70		393
Ending balance, Foreign currency items,	(2,168)	[1]	(1,755)	[1]
Beginning balance, Retirement plan items	(14,195)	[1]	(13,453)	[1]
Other comprehensive income before reclassification adjustments, Retirement plan items		[1]		[1]
Amounts reclassified from accumulated other comprehensive loss, Retirement plan items	376	[1],[2]	322	[1],[2]
Net current period other comprehensive income, Retirement plan items	376		322
Ending balance, Retirement plan items	(13,819)	[1]	(13,131)	[1]
Beginning balance	(16,433)	[1]	(15,601)	[1]
Other comprehensive income before reclassification adjustments	70	[1]	393	[1]
Amounts reclassified from accumulated other comprehensive loss	376	[1]	322	[1]
Net current period other comprehensive income	446		715
Ending balance	$ (15,987)	[1]	$ (14,886)	[1]

[1] All amounts are net of tax. Amounts in parentheses indicate debits.

[2] These components were reclassified, gross of tax, as part of net periodic cost associated with the amortization of the actuarial loss related to the Company's benefit plan obligations. See Note 7 for additional details.