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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Line Items]                          
Tax Cuts and Jobs Act, percentage of depreciation for certain fixed assets acquired                     100.00%    
Tax Cuts and Jobs Act, accounting complete                     true    
Tax Cuts and Jobs Act, accounting completion date                     Sep. 30, 2018    
Tax Cuts and Jobs Act, change in tax rate, discrete tax benefit                     $ 11,101,000    
Federal statutory tax rate         35.00%         21.00%   35.00% 35.00%
Income from continuing operations before tax   $ (36,925,000) $ (11,421,000) $ 82,783,000 $ 28,670,000 $ (29,092,000) $ (21,766,000) $ 66,996,000 $ 31,138,000 $ 34,400,000 63,107,000 $ 47,276,000 $ 78,672,000
Income Tax Disclosure [Abstract]                          
Increase in net valuation allowance                     800,000 $ 100,000  
Unrecognized income tax benefits   $ 0               $ 0 $ 0    
Federal                          
Income Tax Disclosure [Abstract]                          
Number of years for examination                     4 years    
Federal | Tax Year 2017                          
Income Tax Disclosure [Line Items]                          
Corporate income tax rate         35.00%                
Federal | Tax Year 2018                          
Income Tax Disclosure [Line Items]                          
Corporate income tax rate                     21.00%    
State                          
Income Tax Disclosure [Abstract]                          
Net operating loss carry forwards $ 3,700,000                        
State | Minimum                          
Income Tax Disclosure [Abstract]                          
Expiration date of net operating loss carryforward Dec. 31, 2023                        
State | Maximum                          
Income Tax Disclosure [Abstract]                          
Expiration date of net operating loss carryforward Dec. 31, 2037                        
New York                          
Income Tax Disclosure [Abstract]                          
Number of years for examination                     4 years    
Connecticut                          
Income Tax Disclosure [Abstract]                          
Number of years for examination                     4 years    
Pennsylvania                          
Income Tax Disclosure [Abstract]                          
Number of years for examination                     4 years    
New Jersey                          
Income Tax Disclosure [Abstract]                          
Number of years for examination                     5 years