Income Taxes - Additional Information (Detail) - USD ($)	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2015	Nov. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Line Items]
Effect of federal tax law change	$ 5,200,000			$ 5,229,000
Built-in-gains recognition period	5 years	10 years
U.S. federal statutory rate			35.00%
Deferred tax benefit	$ 153,464,000		$ 157,150,000	153,464,000
Charitable contribution carryforwards			2,200,000
State net operating loss carryforwards			431,300,000
Unrecognized tax benefits	0		0	0
Income tax penalties accrued related to uncertain tax positions	0		0	0
Interest on income taxes accrued related to uncertain tax positions	$ 0		0	0
Charitable Contributions [Member]
Income Tax Disclosure [Line Items]
Deferred tax benefit			$ 800,000
Operating loss carryforwards expire date			2017
Federal [Member]
Income Tax Disclosure [Line Items]
Federal net operating loss carryforwards			$ 83,800,000
Deferred tax benefit			$ 29,300,000
Operating loss carryforwards expire date			2033
Valuation allowances related to federal deferred tax assets			$ 600,000	(8,300,000)	$ 4,300,000
State [Member]
Income Tax Disclosure [Line Items]
Deferred tax benefit			22,300,000
Valuation allowances related to federal deferred tax assets			$ 200,000	$ 1,800,000	$ 3,500,000
State [Member] | Minimum [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards expire date			2017
State [Member] | Maximum [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards expire date			2036