Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, Foreign currency items	$ (2,168)		$ (1,755)		$ (2,238)		$ (2,148)
Other comprehensive income before reclassification adjustments, Foreign currency items	(367)		(664)		(297)		(271)
Amounts reclassified from accumulated other comprehensive loss, Foreign currency items
Net current period other comprehensive income, Foreign currency items	(367)		(664)		(297)		(271)
Ending balance, Foreign currency items	(2,535)		(2,419)		(2,535)		(2,419)
Beginning balance, Retirement plan items	(13,819)		(13,131)		(14,195)		(13,453)
Other comprehensive income before reclassification adjustments, Retirement plan items
Amounts reclassified from accumulated other comprehensive loss, Retirement plan items	376	[1]	318	[1]	752	[1]	640	[1]
Net current period other comprehensive income, Retirement plan items	376		318		752		640
Ending balance, Retirement plan items	(13,443)		(12,813)		(13,443)		(12,813)
Beginning balance	(15,987)		(14,886)		(16,433)		(15,601)
Other comprehensive income before reclassification adjustments	(367)		(664)		(297)		(271)
Amounts reclassified from accumulated other comprehensive loss	376		318		752		640
Net current period other comprehensive income	9		(346)		455		369
Ending balance	$ (15,978)		$ (15,232)		$ (15,978)		$ (15,232)

[1] 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.