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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Impact on income before income taxes $ (3,182) $ (2,746) $ (9,956) $ (8,477)
Income tax benefit 1,237 1,068 3,868 3,296
Impact on net income $ (1,945) $ (1,678) $ (6,088) $ (5,181)