Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Statements of Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net (loss) earnings	$ (5,321)		$ 8,838
Unrealized gain on short-term investments	8		19
Changes in pension plan assets and benefit obligations	(1)		(4)
Tax effect	(5)		(10)
Total comprehensive income	(5,313)		8,853
Parent Company Only (issuer) [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) earnings	(5,321)		8,838
Unrealized gain on short-term investments	14		32
Changes in pension plan assets and benefit obligations	(1)		(7)
Tax effect	(5)		(10)
Total comprehensive income	(5,313)		8,853
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) earnings	2,735	[1]	2,744	[1]
Unrealized gain on short-term investments		[1]		[1]
Changes in pension plan assets and benefit obligations		[1]		[1]
Tax effect		[1]		[1]
Total comprehensive income	2,735	[1]	2,744	[1]
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) earnings	(2,735)		(2,744)
Unrealized gain on short-term investments
Changes in pension plan assets and benefit obligations
Tax effect
Total comprehensive income	$ (2,735)		$ (2,744)

[1] Foreign subsidiaries represent minor subsidiaries and are included in the guarantors' subsidiaries amounts.