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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
Mar. 31, 2013
Mar. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Impact on income before income taxes $ (3,637) $ (2,594)
Income tax benefit 1,413 1,009
Impact on net income $ (2,224) $ (1,585)