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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 |  |

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