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Borrowings Under Repurchase Agreements - Additional Information (Detail) (Line of Credit [Member], USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
UBS [Member]
Mar. 31, 2014
UBS [Member]
Dec. 31, 2013
UBS [Member]
Sep. 30, 2013
UBS [Member]
Six Month LIBOR [Member]
Feb. 28, 2013
JP Morgan Chase [Member]
Mar. 31, 2014
JP Morgan Chase [Member]
Dec. 31, 2013
JP Morgan Chase [Member]
Feb. 28, 2013
JP Morgan Chase [Member]
One Month LIBOR [Member]
Mar. 31, 2014
JP Morgan Chase [Member]
One Month LIBOR [Member]
Mar. 31, 2014
Wells Fargo [Member]
Dec. 31, 2013
Wells Fargo [Member]
Dec. 22, 2011
Wells Fargo [Member]
One Month LIBOR [Member]
Feb. 28, 2013
Wells Fargo [Member]
One Month LIBOR [Member]
Aug. 31, 2010
Wells Fargo [Member]
One Month LIBOR [Member]
Mar. 31, 2014
Wells Fargo [Member]
One Month LIBOR [Member]
Dec. 31, 2013
Wells Fargo [Member]
One Month LIBOR [Member]
Feb. 28, 2013
Wells Fargo [Member]
One Month LIBOR [Member]
Commercial Mortgage Backed Securities [Member]
Jun. 30, 2012
Wells Fargo [Member]
One Month LIBOR [Member]
Commercial Mortgage Backed Securities [Member]
Debt Instrument [Line Items]                                        
Maximum borrowing under facility     $ 133,333,000   $ 133,899,000                              
Expiration period 3 years 9 months 18 days 3 years 3 months 12 days 4 years 4 years 6 months 4 years 8 months 12 days     9 months 18 days 1 year 1 month 6 days     10 months 24 days 2 months 12 days              
Line of Credit Facility, Period of Potential Extension     1 year                                  
Basis point           1.55%       2.50% 2.50%     1.50% 1.05% 1.25% 0.80% 1.05% 1.75% 2.35%
Line of Credit Facility, Estimated Fair Value of Collateral Pledged Percentage     100.00%                                  
Line of Credit Facility, Margin of Cash Borrowed, Percentage     22.50%                                  
Line of Credit, Covenant, Minimum Net Asset Value     500,000,000                                  
Line of Credit, Covenant, Maximum Debt to Tangible Net Worth Ratio     3                                  
Line of Credit Facility, Threshold Amount for Margin Calls             $ 0                          
Line of Credit Facility, Loan Extension Fee Percentage             0.25%