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Compensation Expense for Restricted Stock Recognized in Condensed Consolidated Statements of Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Impact on income before income taxes $ (2,746) $ (2,487) $ (8,477) $ (7,191)
Income tax benefit 1,068 968 3,296 2,798
Impact on net income $ (1,678) $ (1,519) $ (5,181) $ (4,393)