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Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income Per Common Share (Detail)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Earnings Per Share Disclosure [Line Items]    
Basic method 193,922,260 193,092,509 [1]
Dilutive stock options and restricted stock units 962,473 1,504,859
Diluted method 194,884,733 194,597,368 [1]
[1] Reclassified to conform to current presentation.