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Borrowings Under Repurchase Agreements - Additional Information (Detail) (Line of Credit [Member], USD $)
9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 0 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Apr. 30, 2014
Deutsche Bank AG [Member]
Sep. 30, 2014
JP Morgan Chase [Member]
Dec. 31, 2013
JP Morgan Chase [Member]
Sep. 30, 2014
Wells Fargo [Member]
Dec. 31, 2013
Wells Fargo [Member]
Apr. 30, 2014
Minimum [Member]
Deutsche Bank AG [Member]
Three Month LIBOR [Member]
Apr. 30, 2014
DB Facility [Member]
Deutsche Bank AG [Member]
Sep. 30, 2014
DB Facility [Member]
Deutsche Bank AG [Member]
Apr. 30, 2014
DB Facility [Member]
Minimum [Member]
Deutsche Bank AG [Member]
Apr. 30, 2014
DB Facility [Member]
Maximum [Member]
Deutsche Bank AG [Member]
Apr. 30, 2014
DB Facility [Member]
Maximum [Member]
Deutsche Bank AG [Member]
Three Month LIBOR [Member]
Sep. 30, 2014
Amended DB Facility [Member]
Deutsche Bank AG [Member]
Apr. 25, 2014
JP Morgan Facility [Member]
JP Morgan Chase [Member]
subsidiary
Jun. 06, 2014
JP Morgan Facility [Member]
JP Morgan Chase [Member]
May 22, 2014
JP Morgan Facility [Member]
JP Morgan Chase [Member]
May 09, 2014
JP Morgan Facility [Member]
JP Morgan Chase [Member]
Apr. 25, 2014
JP Morgan Facility [Member]
Maximum [Member]
JP Morgan Chase [Member]
Jun. 06, 2014
JP Morgan Amendment Letter [Member]
JP Morgan Chase [Member]
May 22, 2014
JP Morgan Amendment Letter [Member]
JP Morgan Chase [Member]
May 09, 2014
JP Morgan Amendment Letter [Member]
JP Morgan Chase [Member]
Jun. 12, 2014
JP Morgan, Third Amendment and Restatement [Member]
JP Morgan Chase [Member]
Oct. 01, 2014
Subsequent Event [Member]
Amended DB Facility [Member]
Deutsche Bank AG [Member]
Debt Instrument [Line Items]                                                
Maximum borrowing under facility     $ 100,000,000                     $ 275,000,000   $ 100,000,000 $ 100,000,000 $ 100,000,000   $ 146,814,000 $ 146,814,000 $ 146,814,000 $ 175,000,000 $ 300,000,000
Expiration period 2 years 9 months 18 days 3 years 3 months 12 days   3 months 18 days 1 year 1 month 6 days 4 months 24 days 2 months 12 days   4 years                              
Basis point               1.80%         2.32%                      
Margin ratio                     125.00% 181.82%                        
Line of credit facility, covenant terms, minimum shareholder's equity of gross capital proceeds (percentage)                   50.00%                            
Number of subsidiaries entered into agreement for temporary waiver of covenant term                             2                  
Temporary waiver term                             30 days                  
Line of credit facility, covenant terms, total consolidated indebtedness, percent                                     10.00%       5.00%  
Line of credit facility, covenant terms, total consolidated indebtedness, amount                                     $ 12,500,000       $ 15,000,000