Income Taxes - Reconciliation of Income Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Amount
Tax expense (benefit) at statutory rate, Amount	$ (4,658)	$ (18,299)	$ 99,062
State income taxes, Amount	3,469	2,281	(2,894)
Tax-free disposition of investment, Amount	0	0	(145,524)
Uncertain tax position, Amount	0	(15,451)	6,106
Domestic production activities deduction, Amount	(2,456)	0	0
Corporate owned life insurance, Amount	(947)	(870)	(1,776)
Nondeductible executive compensation, Amount	851	683	449
Change in valuation allowances, Amount	(2,209)	3,016	(213)
Other, Amount	721	(3,456)	2,465
Total income tax benefit	$ (5,229)	$ (32,096)	$ (42,325)
Percentage
Tax expense (benefit) at statutory rate, Percentage	35.00%	35.00%	35.00%
State income taxes, Percentage	(26.10%)	(4.40%)	(1.00%)
Tax-free disposition of investment, Percentage	(0.00%)	(0.00%)	(51.40%)
Uncertain tax position, Percentage	0.00%	29.60%	2.20%
Domestic production activities deduction, Percentage	18.50%	(0.00%)	(0.00%)
Corporate owned life insurance, Amount	7.10%	1.70%	(0.60%)
Nondeductible executive compensation, Percentage	(6.40%)	(1.30%)	0.20%
Change in valuation allowances, Percentage	16.60%	(5.80%)	(0.10%)
Other, Percentage	(5.40%)	6.60%	0.80%
Total, Percentage	39.30%	61.40%	(14.90%)