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Components of Income Tax Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Current income tax expense:        
Foreign $ 70 $ 61 $ 161 $ 125
U.S. Federal (2,657) 7,821 (1,547) 7,551
Total current income tax expense (benefit) (2,587) 7,882 (1,386) 7,676
Deferred income tax expense (benefit):        
U.S. Federal 1,242 3,708 (3,515) 2,065
Total deferred income tax expense (benefit) 1,242 3,708 (3,515) 2,065
Total income tax expense (benefit) $ (1,345) $ 11,590 $ (4,901) $ 9,741