Commercial Real Estate Investments - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended
	Jan. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Real Estate Properties [Line Items]
Securitization financing transaction, purchase	$ 399,500,000	$ 64,543,949,000	$ 61,781,001,000	[1]
Securitization financing transaction, total	260,700,000	513,510,000	2,527,668,000	[1]
Securitization financing transaction, weighted average rate	65.30%
Securitization financing transaction, variable interest rate	1.74%
Securitization financing transaction, variable interest rate description		LIBOR plus 1.74%
Assets carrying value		398,100,000
Unamortized origination fees		1,400,000
Liabilities carrying value		260,700,000
Other Assets
Real Estate Properties [Line Items]
Securitization cost	$ 4,300,000

[1] Derived from the audited consolidated financial statements at December 31, 2013.