Total Income Tax (Benefit) Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current taxes
Federal taxes									$ (8,790)	$ (17,711)	$ 57
State taxes									93	140	640
Foreign taxes									330		506
Current taxes									(8,367)	(17,571)	1,203
Deferred taxes
Federal taxes									(1,319)		(376)
State taxes									(3,181)		537
Foreign taxes									(64)		(28)
Deferred taxes									(4,564)		133
Income tax (benefit) expense	$ (10,556)	$ (1,870)	$ (599)	$ 94	$ (17,601)	$ (99)	$ 56	$ 73	$ (12,931)	$ (17,571)	$ 1,336