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Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income Per Common Share (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share Disclosure [Line Items]        
Basic method 194,290,277 193,517,785 [1] 194,126,104 193,342,825 [1]
Dilutive stock options and restricted stock units 767,675 893,331 748,468 1,206,021
Diluted method 195,057,952 194,411,116 [1] 194,874,572 194,548,846 [1]
[1] Reclassified to conform to current presentation.