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Employee Benefit Plans - Schedule of Activity Relating to Restricted Stock Units Outstanding (Detail) (Restricted Stock Units (RSUs) [Member], USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
BALANCE, RSUs OUTSTANDING 170,825 123,200 85,600
Granted, NUMBER OF RSUs OUTSTANDING 52,125 47,625 37,600
Settled, NUMBER OF RSUs OUTSTANDING (2,780)    
Cancelled, NUMBER OF RSUs OUTSTANDING (3,820)    
BALANCE, RSUs OUTSTANDING 216,350 170,825 123,200
Granted, FAIR VALUE AMOUNT $ 864,000 $ 1,043,000 $ 864,000
Settled, FAIR VALUE AMOUNT 70,000    
Cancelled, FAIR VALUE AMOUNT $ 88,000    
Granted, FAIR VALUE AVERAGE PER RSU $ 16.57 $ 21.90 $ 22.97
Settled, FAIR VALUE AVERAGE PER RSU $ 25.31    
Cancelled, FAIR VALUE AVERAGE PER RSU $ 23.10