Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Valuation Allowance [Line Items]      
Computed at federal statutory rate 21.00% 21.00% 35.00%
Income taxes receivable $ 1,236 $ 2,471  
State 2,137 523 $ 0
Other, net (389) 285 332
Liabilities for unrecognized tax benefits 0 0  
Deferred Tax Assets, Valuation Allowance 114,939 128,650  
Income Tax Examination, Penalties and Interest Expense $ 0 $ 0 $ 0
Effective Income Tax Rate Reconciliation, Percent 3.00% 0.20% (17.80%)
Deferred Tax Assets, Tax Credit Carryforwards $ 1,200    
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount 0 $ 0 $ 86,612
Federal      
Valuation Allowance [Line Items]      
Operating Loss Carryforwards 613,400    
State and Local Jurisdiction      
Valuation Allowance [Line Items]      
Operating Loss Carryforwards $ 437,900    
Federal, State and Local Tax Jurisdictions      
Valuation Allowance [Line Items]      
Deferred Tax Assets, Valuation Allowance   $ 114,900