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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]        
Federal statutory rate (percent)   21.00%    
Tax provision (benefit) to remeasure certain deferred tax assets and liabilities $ 22,000,000 $ (740,000) $ 22,000,000  
Valuation allowance related to deferred tax assets 3,478,000 3,449,000 3,478,000  
Impairment of joint venture   0 13,200,000 $ 0
Unpaid interest amount 0   0  
Tax benefit that would result if uncertain tax positions are reversed   972,000    
State and Local Jurisdiction        
Income Tax Contingency [Line Items]        
Net operating loss carryforward   283,300,000    
Valuation allowance related to deferred tax assets $ 3,500,000 $ 3,400,000 $ 3,500,000  
State and Local Jurisdiction | Minimum [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforward, expire date   Dec. 31, 2028    
State and Local Jurisdiction | Maximum [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforward, expire date   Dec. 31, 2036