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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%