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Short-Term Borrowing - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended 6 Months Ended 9 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Aug. 30, 2012
May 31, 2011
Jun. 30, 2013
Revolving Credit Facility
Aug. 30, 2012
Revolving Credit Facility
May 31, 2011
Revolving Credit Facility
Sep. 30, 2013
Fund-Based Credit Facility
Dec. 31, 2012
Fund-Based Credit Facility
Sep. 30, 2013
Non-Fund-Based Credit Facility
Dec. 31, 2012
Non-Fund-Based Credit Facility
Jun. 30, 2013
Original Margin
Sep. 30, 2013
Original Margin
Line of Credit Facility [Line Items]                          
Fund-based and non-fund-based credit facilities limits available $ 16,393 $ 18,489                      
Utilization of credit facility for non fund-based usage 6,686 5,942                      
Credit facility, maximum borrowing capacity     925,000 380,000   250,000 260,000            
Credit facility, amount utilized $ 87,439 $ 4,397           $ 80,000 $ 0 $ 7,439 $ 4,397    
Margin over LIBOR 2.75% 3.25%     2.50%     2.50%       3.25% 3.25%
Percentage of commitment fee 0.50%                        
Revolving credit facility, expiration month and year 2017-08                        
Line of credit covenant condition Indebtedness under these facilities is secured by certain assets and the credit agreement contains certain covenants, including a maximum leverage covenant that becomes effective only if the revolving facility is drawn for $50,000 or more.