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Residential Loans at Amortized Cost, Net - Schedule of Purchased Residential Loans Deemed to be Credit-Impaired (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]    
Contractually required cash flows for acquired loans at acquisition $ 5,271us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition $ 6,593us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
Nonaccretable difference (3,920)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference (4,921)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
Expected cash flows for acquired loans at acquisition 1,351us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition 1,672us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
Accretable yield 0us-gaap_CertainLoansAcquiredInTransferAccretableYield 0us-gaap_CertainLoansAcquiredInTransferAccretableYield
Fair value at acquisition $ 1,351us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue $ 1,672us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue