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Related-Party Arrangements - Additional Information (Detail)
1 Months Ended 6 Months Ended
Oct. 31, 2013
USD ($)
Oct. 31, 2007
USD ($)
Jun. 30, 2016
USD ($)
May 31, 2015
ft²
Related Party Transaction [Line Items]        
Amount available for future borrowings     $ 30,100,000  
Additional borrowings     $ 0  
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]        
Principal amount outstanding under credit facility     $ 49,500,000  
Amount available for future borrowings     $ 30,100,000  
Fixed borrowing rate     5.84%  
Accrued interest payable     $ 7,800,000  
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  
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