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Residential Loans - Geographic Concentration of Residential Loans Recorded on Consolidated Balance Sheet (Detail) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Residential Loans Held For Sale |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Residential Loans Held For Sale | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 41.00% | 39.00%
Residential Loans Held For Sale | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 9.00% | 9.00%
Residential Loans Held For Sale | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 6.00% | 5.00%
Residential Loans Held For Sale | Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 0.00%
Residential Loans Held For Sale | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 4.00% | 4.00%
Residential Loans Held For Sale | Virginia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% | 5.00%
Residential Loans Held For Sale | Georgia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% | 2.00%
Residential Loans Held For Sale | Massachusetts |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 6.00%
Residential Loans Held For Sale | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 2.00%
Residential Loans Held For Sale | Other states |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 26.00% | 28.00%
Residential Loans Held for Investment |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Residential Loans Held for Investment | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 18.00% | 20.00%
Residential Loans Held for Investment | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 6.00% | 5.00%
Residential Loans Held for Investment | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 2.00%
Residential Loans Held for Investment | Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% | 0.00%
Residential Loans Held for Investment | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 14.00% | 13.00%
Residential Loans Held for Investment | Virginia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% | 3.00%
Residential Loans Held for Investment | Georgia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Residential Loans Held for Investment | Massachusetts |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 2.00%
Residential Loans Held for Investment | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 8.00% | 8.00%
Residential Loans Held for Investment | Other states |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 39.00% | 42.00%
Residential Loans Held For Investment at Fair Value |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Residential Loans Held For Investment at Fair Value | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 39.00% | 24.00%
Residential Loans Held For Investment at Fair Value | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 11.00% | 14.00%
Residential Loans Held For Investment at Fair Value | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% | 4.00%
Residential Loans Held For Investment at Fair Value | Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 8.00%
Residential Loans Held For Investment at Fair Value | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 4.00% | 6.00%
Residential Loans Held For Investment at Fair Value | Virginia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 4.00% | 7.00%
Residential Loans Held For Investment at Fair Value | Georgia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 0.00%
Residential Loans Held For Investment at Fair Value | Massachusetts |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 4.00% | 5.00%
Residential Loans Held For Investment at Fair Value | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 3.00%
Residential Loans Held For Investment at Fair Value | Other states |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 24.00% | 29.00%

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