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Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income Per Common Share (Detail)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Earnings Per Share Disclosure [Line Items]    
Basic method193,517,785191,943,813[1]193,342,825191,577,000[1]
Dilutive stock options and restricted stock units893,3311,494,1791,206,0211,289,485
Diluted method194,411,116193,437,992[1]194,548,846192,866,485[1]
[1]Reclassified to conform to current presentation