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Short-Term Borrowings - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2016
Jun. 30, 2015
Dec. 31, 2015
Mar. 23, 2015
Jan. 27, 2015
Aug. 30, 2012
Line of Credit Facility [Line Items]            
Fund-based and non-fund-based credit facilities limits available $ 15,502   $ 15,781      
Utilization of credit facility for non fund-based usage 10,630   10,301      
Credit facility, maximum borrowing capacity           $ 925,000
Credit facility, amount utilized $ 82,947   $ 22,947      
Margin over LIBOR 1.50% 1.50% 1.50%      
Percentage of commitment fee 0.25%   0.25%      
Revolving credit facility, expiration month and year 2020-06          
Line of credit covenant condition The credit agreement contains certain customary covenants, including a maximum leverage covenant and a minimum interest coverage ratio.          
Short term loans $ 81,500   $ 21,500      
Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Credit facility, maximum borrowing capacity 350,000         $ 250,000
Fund-Based Credit Facility            
Line of Credit Facility [Line Items]            
Credit facility, amount utilized $ 81,500   $ 21,500      
Margin over LIBOR 1.50%   1.50%      
Non-Fund-Based Credit Facility            
Line of Credit Facility [Line Items]            
Credit facility, amount utilized $ 1,447   $ 1,447      
Morgan Stanley Senior Funding, Inc            
Line of Credit Facility [Line Items]            
Short term loans       $ 737,500 $ 672,500  
Short term borrowings fixed interest rate 2.00%          
Debt issuance cost $ 1,045          
Interest expense $ 235