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Bank Call Loans - Summary of Bank Call Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Brokers And Dealers [Abstract]    
Year-end balance $ 118,200 $ 128,300
Weighted interest rate (at end of year) 1.28% 1.23%
Maximum balance (at any month-end) 266,300 171,400
Average amount outstanding (during the year) $ 164,434 $ 73,227
Average interest rate (during the year) 1.25% 1.27%