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Related-Party Arrangements - Additional Information (Detail)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2013
USD ($)
Oct. 31, 2007
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
May. 31, 2015
ft²
Related Party Transaction [Line Items]            
Amount available for future borrowings     $ 30,100,000   $ 30,100,000  
Additional borrowings     $ 0   $ 0  
Mann Foundation | Sublease Agreement            
Related Party Transaction [Line Items]            
Area of office space leased | ft²           12,500
Lease expiration period     2017-04      
Lease payment     $ 65,000 $ 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   $ 49,500,000  
Amount available for future borrowings     $ 30,100,000   $ 30,100,000  
Fixed borrowing rate     5.84%   5.84%  
Interest payable     $ 7,100,000   $ 7,100,000  
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%