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Variable Interest Entities - Quantitative Inputs and Assumptions Used for Liabilities at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Subordinated Notes [Member]
Dec. 31, 2012
Subordinated Notes [Member]
Jun. 30, 2013
Subordinated Notes [Member]
Range One [Member]
Jun. 30, 2013
Subordinated Notes [Member]
Range Two [Member]
Jun. 30, 2013
Subordinated Notes [Member]
Range Three [Member]
Jun. 30, 2013
Senior Secured Notes [Member]
Dec. 31, 2012
Senior Secured Notes [Member]
Jun. 30, 2013
Senior Secured Notes [Member]
Range One [Member]
Jun. 30, 2013
Senior Secured Notes [Member]
Range Two [Member]
Jun. 30, 2013
Senior Secured Notes [Member]
Range Three [Member]
Jun. 30, 2013
Minimum [Member]
Jun. 30, 2013
Minimum [Member]
Subordinated Notes [Member]
Range One [Member]
Jun. 30, 2013
Minimum [Member]
Subordinated Notes [Member]
Range Two [Member]
Jun. 30, 2013
Minimum [Member]
Senior Secured Notes [Member]
Range One [Member]
Jun. 30, 2013
Minimum [Member]
Senior Secured Notes [Member]
Range Three [Member]
Jun. 30, 2013
Maximum [Member]
Jun. 30, 2013
Maximum [Member]
Subordinated Notes [Member]
Range One [Member]
Jun. 30, 2013
Maximum [Member]
Subordinated Notes [Member]
Range Two [Member]
Jun. 30, 2013
Maximum [Member]
Subordinated Notes [Member]
Range Three [Member]
Jun. 30, 2013
Maximum [Member]
Senior Secured Notes [Member]
Range One [Member]
Jun. 30, 2013
Maximum [Member]
Senior Secured Notes [Member]
Range Two [Member]
Jun. 30, 2013
Maximum [Member]
Senior Secured Notes [Member]
Range Three [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                                                
Fair value of Senior Secured and Subordinated Notes         $ 766,611           $ 2,071,470                              
Valuation Technique         Discounted Cash Flow         Discounted Cash Flow                            
Unobservable Input         Discount Rate Default Rate Recovery Rate     Discount Rate Default Rate Recovery Rate                        
Discount Rate                         9.20% 10.00%   1.90%   11.10% 12.00%     2.10%    
Default Rate                             1.00%         1.50%     2.00%  
Recovery Rate                                 30.00%       75.00%     65.00%
Weighted Average, Discount Rate             10.30%     1.04% 1.30% 2.00%                            
Weighted Average, Default Rate           1.20%         2.00%                          
Weighted Average, Recovery Rate             75.00%         59.90%