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Summary of Restricted Stock Activity under Plan (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Number of restricted shares      
Restricted stock outstanding, beginning of period 923,740 783,606 751,437
Issuances 670,818 597,062 395,869
Lapse of restrictions (462,141) (419,543) (343,657)
Forfeitures (23,543) (37,385) (20,043)
Restricted stock outstanding, end of period 1,108,874 923,740 783,606
Weighted average fair value      
Restricted stock outstanding, beginning of period $ 20.08 $ 17.24 $ 20.68
Issuances $ 31.43 $ 23.62 $ 15.79
Lapse of restrictions $ 18.29 $ 19.91 $ 23.09
Forfeitures $ 26.10 $ 18.92 $ 18.07
Restricted stock outstanding, end of period $ 27.56 $ 20.08 $ 17.24