Income Taxes - Reconciliation of Income Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amount
Tax expense (benefit) at statutory rate	$ 7,435	$ 70,928	$ (4,658)
State income taxes	1,844	9,620	3,469
Corporate owned life insurance	(933)	0	(947)
Nondeductible executive compensation	371	1,130	851
Change in valuation allowances	5,851	1,080	(2,209)
Share-based compensation(1)	2,995	0	0
Domestic production activities deduction	(244)	(4,393)	(2,456)
Deemed repatriation of foreign earnings	2,106	0	0
Tax reform revaluation of deferred taxes	(45,840)	0	0
Other	236	3,669	721
Total income tax expense (benefit)	$ (26,179)	$ 82,034	$ (5,229)
Percentage
Tax expense (benefit) at statutory rate (as a percent)	35.00%	35.00%	35.00%
State income taxes (as a percent)	8.70%	4.80%	(26.10%)
Corporate owned life insurance (as a percent)	(4.40%)	(0.00%)	7.10%
Nondeductible executive compensation (as a percent)	1.80%	0.60%	(6.40%)
Change in valuation allowances (as a percent)	27.50%	0.50%	16.60%
Share-based payment tax deficiencies (as a percent)	14.10%	0.00%	0.00%
Domestic production activities deduction (as a percent)	(1.20%)	(2.20%)	18.50%
Deemed repatriation of foreign earnings (as a percent)	9.90%	0.00%	0.00%
Tax reform revaluation of deferred taxes (as a percent)	(215.80%)	0.00%	0.00%
Other (as a percent)	1.20%	1.80%	(5.40%)
Total (as a percent)	(123.20%)	40.50%	39.30%