Income Taxes - Income Tax Expense (Benefit) from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
U.S. federal	$ 7,470	$ 6,306	$ 4,175
State	514	210	41
Total current expense	7,984	6,516	4,216
Deferred:
U.S. federal	(12,004)	(9,800)	(10,902)
State	(538)	(58)	(699)
Foreign	(65)	0	0
Total deferred benefit	(12,607)	(9,858)	(11,601)
Income tax benefit	$ (4,623)	$ (3,342)	$ (7,385)