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Components of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Current income tax expense (benefit):
Foreign	$ 39	$ 51	$ 164	$ 125
U.S. Federal	(1,571)	(2,461)	5,980	(851)
Total current income tax expense (benefit)	(1,532)	(2,410)	6,144	(726)
Deferred income tax expense (benefit):
U.S. Federal	(101)	518	1,964	(1,697)
Total deferred income tax expense (benefit)	(101)	518	1,964	(1,697)
Effective income tax expense (benefit)	$ (1,633)	$ (1,892)	$ 8,108	$ (2,423)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.