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Summary of Other Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]    
Margin receivable $ 58,455 $ 31,149
Investment receivable 3,142 8,923
Other pledged collateral 5,000 5,000
REO 3,323 3,661
Prepaid expenses 1,576 1,850
Fixed assets and leasehold improvements 1,754 1,232
Income tax receivables 2,902 170
Other 1,612 1,655
Total Other Assets $ 77,764 $ 53,640