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Loans Receivable - Overall Statistics for Loan Receivables Portfolio (Parenthetical) (Detail) (LIBOR [Member])
Jun. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
LIBOR rate 0.19% 0.21%
Minimum [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
LIBOR rate 0.20%  
Maximum [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
LIBOR rate 1.00%