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Bank Call Loans - Summary of Bank Call Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Bank Call Loans [Line Items]    
Year-end balance $ 128,300 $ 27,500
Weighted interest rate (at end of year) 1.23% 1.25%
Maximum balance (at any month end) 171,400 178,600
Average amount outstanding (during the year) $ 73,227 $ 92,657
Average interest rate (during the year) 1.27% 1.25%