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Fair Value Measurements - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
SecurityLoan
Mar. 31, 2013
Dec. 31, 2013
SecurityLoan
Loans Receivable [Line Items]      
Fair value of asset transfer from Level 1 to Level 2 on recurring basis $ 0    
Fair value of asset transfer from Level 2 to Level 1 on recurring basis 0    
Fair value of liabilities transfer from Level 1 to Level 2 on recurring basis 0    
Fair value of liabilities transfer from Level 2 to Level 1 recurring basis 0    
Transfers out of Level 3        
Liabilities measured at fair value on a recurring basis     0
Liabilities measured at estimated fair value on nonrecurring basis $ 0   $ 0
Number of loans, held for sale 0   0