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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Mar. 19, 2012
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Net income attributable to common and participating stockholders | $ 33,911,000 | $ (21,145,000) | $ 21,376,000 | $ 47,814,000 |  |
Percentage of net operating loss carry forwards | 100.00% |  | 100.00% |  |  |
Valuation allowance recorded to be reduce to | 0.00% |  | 0.00% |  |  |
Income tax expense or benefit |  |  | $ 0 |  | $ 0 |
Income tax at the federal statutory rate of 35% |  |  | 35.00% |  |  |
Income tax paid |  |  | $ 0 |  | $ 0 |
Valuation allowance equal to net deferred federal income tax asset | 100.00% |  | 100.00% |  | 100.00% |
Abandoned stock |  |  |  |  |  | $ 8,370,000,000
Available and utilizable NOL carry forward |  |  |  |  | $ 6,000,000,000 |
NOLs expiration date |  |  | 2031 |  |  |
Reserves for uncertain federal income tax positions | $ 0 |  | $ 0 |  |  |
Income tax interest income, expense or penalties |  |  | $ 0 |  | $ 0 |
Income tax examination, year under examination |  |  | 2011 |  |  |

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