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Related-Party Arrangements - Additional Information (Detail) |  |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 11, 2018 USD ($) $ / shares shares | Oct. 23, 2017 shares | Oct. 10, 2017 $ / shares shares | May 31, 2015 USD ($) ft² | Oct. 31, 2013 USD ($) | Oct. 31, 2007 USD ($) | Mar. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Jun. 30, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 140,200,000 |  |
Loss on extinguishment of debt |  |  |  |  |  |  | $ (825,000) |  |
Common stock, shares issued | shares |  |  |  |  |  |  | 126,013,051 | 119,053,414 |
Common stock, par value | $ / shares |  |  |  |  |  |  | $ 0.01 | $ 0.01 |
Amount available for future borrowings |  |  |  |  |  |  | $ 0 | $ 0 |
Common Stock |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares |  | 973,236 |  |  |  |  |  |  |
Charitable Foundation | Common Stock | Director |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares |  |  | 166,600 |  |  |  |  |  |
Exchange price per share | $ / shares |  |  | $ 6.00 |  |  |  |  |  |
The Mann Group LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Loan agreement with related party |  |  |  |  | $ 370,000,000 | $ 350,000,000 |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | 800,000 |  |
Unamortized premium |  |  |  |  |  |  | 800,000 |  |
Debt issuance costs |  |  |  |  |  |  | $ 100,000 |  |
The Mann Group LLC | Amended Agreement |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  | Jan. 05, 2020 |  |
The Mann Group LLC | Loan Arrangement |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Accrued interest of related party debt |  |  |  |  |  |  | $ 3,500,000 | 2,300,000 | $ 10,700,000
Available amount of credit facility under covenant restrictions |  |  |  |  |  |  |  |  | $ 19,400,000
Common stock, shares issued | shares | 3,000,000 |  |  |  |  |  |  |  |
Common stock, par value | $ / shares | $ 2.72 |  |  |  |  |  |  |  |
Principal balance cancelled amount | $ 8,200,000 |  |  |  |  |  |  |  |
Fixed borrowing rate |  |  |  |  |  |  | 5.84% |  |
Related party transaction prepayment period |  |  |  |  |  |  | 90 days |  |
Aggregate principal amount cancelled |  |  |  |  |  |  | $ 113,200,000 |  |
The Mann Group LLC | Loan Arrangement | Maximum |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amount prepaid for cancellation of indebtedness |  |  |  |  |  |  | $ 200,000,000 |  |
The Mann Group LLC | Loan Arrangement | Minimum |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of months advances outstanding |  |  |  |  |  |  | 12 months |  |
The Mann Group LLC | Amended and Restated Loan Arrangement |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Maturity date | Jul. 01, 2021 |  |  |  |  |  |  |  |
Principal amount | $ 71,500,000 |  |  |  |  |  |  |  |
No of convertible shares | 250 |  |  |  |  |  |  |  |
Principal amount per share | $ / shares | $ 1,000 |  |  |  |  |  |  |  |
Conversion price of shares | $ / shares | $ 4.00 |  |  |  |  |  |  |  |
Related Party Debt |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 71,506,000 | $ 79,666,000 |
Unamortized premium |  |  |  |  |  |  | 815,000 |  |
Debt issuance costs |  |  |  |  |  |  | $ 74,000 |  |
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] |  |  |  |  |  |  |  |  |
Area of office space leased | ft² |  |  |  | 12,500 |  |  |  |  |
Lease expiration period |  |  |  |  |  |  | 2017-04 |  |
Amount of leases renewed per month |  |  |  | $ 20,000 |  |  |  |  |
Lease expiration date |  |  |  |  |  |  | Aug. 31, 2017 |  |
Lease payments |  |  |  |  |  |  | $ 62,000 |  |

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