Earning Per Share (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Earnings Per Share [Abstract]
Basic weighted average shares outstanding	353,346	364,147		381,240
Dilutive effect of stock options and restricted stock/RSUs	0	3,377	[1]	3,996	[1]
Diluted weighted average shares outstanding	353,346	367,524		385,236
Antidilutive outstanding options excluded from computation of earnings per share		23,079		17,867

[1] Excludes the following outstanding options to purchase shares of common stock and nonvested restricted stock because the effect of including these options and restricted shares would be antidilutive: 2010 - 17,867 and 2011 - 23,079.