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Related-Party Arrangements - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2013 USD ($) | Oct. 31, 2007 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | May 31, 2015 ft²
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Accrued interest of related party debt |  |  | $ 9,300,000 | $ 6,400,000 |  |  |
Interest expense on note payable principal stockholder |  |  | 2,901,000 | 2,894,000 |  | $ 2,894,000 |
Expenses related to charter service on behalf of principal shareholder |  |  | 0 | 18,000 |  | 79,000 |
Loan Arrangement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Amount available for future borrowings |  |  | $ 30,100,000 | $ 30,100,000 |  |  |
Mann Foundation | Sublease Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Area of office space leased | ft² |  |  |  |  |  |  | 12,500
Lease expiration period |  |  | 2017-04 |  |  |  |
Lease payment |  |  | $ 268,000 |  | $ 175,000 | $ 0 |
Principal stockholder |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Loan agreement with related party | $ 370,000,000 | $ 350,000,000 |  |  |  |  |
Principal stockholder | Loan Arrangement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Principal amount outstanding under credit facility |  |  | 49,500,000 |  |  |  |
Amount available for future borrowings |  |  | $ 30,100,000 |  |  |  |
Fixed borrowing rate |  |  | 5.84% |  |  |  |
Related party transaction prepayment period |  |  | 90 days |  |  |  |
Aggregate principal amount cancelled |  |  | $ 105,000,000 |  |  |  |
Principal stockholder | Loan Arrangement | Maximum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Amount prepaid for cancellation of indebtedness |  |  | $ 200,000,000 |  |  |  |
Principal stockholder | Loan Arrangement | Minimum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Number of months advances outstanding |  |  | 12 months |  |  |  |
Principal stockholder | Amended Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Maturity date |  |  | Jan. 05, 2020 |  |  |  |
Related Party Debt | Letter Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Description of variable rate interest |  |  | The interest rate will increase to the one-year LIBOR rate calculated on the date of the initial advance or in effect on the date of default, whichever is greater, plus 5% per annum. |  |  |  |
Related Party Debt | Letter Agreement | LIBOR |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest rate (LIBOR) |  |  | 5.00% |  |  |  |

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