Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation Allowance [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	0.1	24.6
Deferred tax assets, valuation allowance	$ 662,909	$ 105,615
Liabilities for unrecognized tax benefits	0	0	$ 0
Interest and penalty charges	0	0	$ 0
Federal
Valuation Allowance [Line Items]
Operating loss carryforwards	$ 508,100
Federal | Minimum
Valuation Allowance [Line Items]
Operating loss carryforward expiration year	2032
Federal | Maximum
Valuation Allowance [Line Items]
Operating loss carryforward expiration year	2035
State and Local Jurisdiction
Valuation Allowance [Line Items]
Operating loss carryforwards	$ 69,400
Operating loss carryforwards, valuation allowance		$ 662,900
State and Local Jurisdiction | Minimum
Valuation Allowance [Line Items]
Operating loss carryforward expiration year	2024
State and Local Jurisdiction | Maximum
Valuation Allowance [Line Items]
Operating loss carryforward expiration year	2035
Federal, State and Local Tax Jurisdictions
Valuation Allowance [Line Items]
Deferred tax assets, valuation allowance	$ 105,600
Federal and state valuation allowance established against net deferred tax assets	$ 557,300