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Other Information Pertaining to Option Activity (Detail) (USD $)
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average grant-date fair value of stock options granted: $ 2,438,000 $ 1,477,000
Total fair value of stock options vested: 1,870,000 1,015,000
Total intrinsic value of stock options exercised: 3,853,000 1,459,000
Total pre-tax share-based compensation expense charged against income: 949,000 935,000
Total unrecognized compensation expense related to non-vested options: $ 4,948,000 $ 4,482,000