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Related-Party Arrangements - Additional Information (Detail) | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2015 USD ($) ft² | Oct. 31, 2013 USD ($) | Oct. 31, 2007 USD ($) | Jun. 30, 2017 USD ($) | Jun. 27, 2017 USD ($) | Dec. 31, 2016 USD ($)
Principal stockholder |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Loan agreement with related party |  | $ 370,000,000 | $ 350,000,000 |  |  |
Principal stockholder | Amended Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Maturity date |  |  |  | Jan. 05, 2020 |  |
Principal stockholder | Loan Arrangement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Accrued interest of related party debt |  |  |  | $ 10,700,000 |  | $ 9,300,000
Available amount of credit facility under covenant restrictions |  |  |  | $ 19,400,000 | $ 19,400,000 |
Fixed borrowing rate |  |  |  | 5.84% |  |
Related party transaction prepayment period |  |  |  | 90 days |  |
Aggregate principal amount cancelled |  |  |  | $ 105,000,000 |  |
Principal amount outstanding under credit facility |  |  |  | 79,700,000 |  | $ 49,500,000
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 |  |
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 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% |  |
Mann Foundation | Sublease Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Lease expiration date |  |  |  | Aug. 31, 2017 |  |
Mann Foundation | Sublease Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Area of office space leased | ft² | 12,500 |  |  |  |  |
Lease expiration period |  |  |  | 2017-04 |  |
Amount of leases renewed per month | $ 20,000 |  |  |  |  |

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