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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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Impact on income before income taxes $ (3,137) $ (2,954) $ (5,731) $ (4,704)
Income tax benefit 1,219 1,149 2,228 1,830
Impact on net income $ (1,918) $ (1,805) $ (3,503) $ (2,874)