Secured Financings - Summary of Statistics for Asset-Specific Repurchase Agreements (Parenthetical) (Detail) (Assets Sold Under Agreements To Repurchase Carrying Amounts [Member])	3 Months Ended
Mar. 31, 2015
Assets Sold Under Agreements To Repurchase Carrying Amounts [Member]
Participating Mortgage Loans [Line Items]
LIBOR basis spread on debt obligation	As of March 31, 2015, our floating rate loans and related liabilities were indexed to the various benchmark rates relevant in each case in terms of currency and payment frequency. Therefore the net exposure to each benchmark rate is in direct proportion to our net assets indexed to that rate. In addition to cash coupon, all-in yield / cost includes the amortization of deferred origination fees / financing costs.

Secured Financings - Summary of Statistics for Asset-Specific Repurchase Agreements (Parenthetical) (Detail) (Assets Sold Under Agreements To Repurchase Carrying Amounts [Member])

3 Months Ended

Mar. 31, 2015

Assets Sold Under Agreements To Repurchase Carrying Amounts [Member]

Participating Mortgage Loans [Line Items]

LIBOR basis spread on debt obligation

As of March 31, 2015, our floating rate loans and related liabilities were indexed to the various benchmark rates relevant in each case in terms of currency and payment frequency. Therefore the net exposure to each benchmark rate is in direct proportion to our net assets indexed to that rate. In addition to cash coupon, all-in yield / cost includes the amortization of deferred origination fees / financing costs.