Capital Stock and Stock Award Plans - Additional Information (Detail) (USD $)	12 Months Ended		12 Months Ended
	Dec. 31, 2012 Vote	Dec. 31, 2011	Dec. 31, 2012 Restricted Stock Awards	Dec. 31, 2012 Stock Option	Dec. 31, 2007 2007 Program	Dec. 31, 2012 2009 Program	Dec. 31, 2009 2009 Program	Dec. 31, 2012 2012 Program
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, par value	$ 0.10	$ 0.10
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	480,000,000	480,000,000
Common stock, par value	$ 0.10	$ 0.10
Entitled vote for each share of Common Stock	1
Minimum percentage of outstanding Common Stock needed by holders of Common Stock to elect all of any class of directors if they choose to do so	50.00%
Maximum shares that can be granted under stock plan	28,000,000
Shares available for stock awards	3,642,000
Stock award, vesting rights	These options are subject to certain vesting requirements over a five-year period, based on the company’s earnings growth.
Stock award, vesting period	5 years		5 years
Unrecognized compensation expense			$ 147,300,000	$ 26,000,000
Restricted stock awards, discount for post-vesting holding restriction, lower limit	12.00%
Restricted stock awards, discount for post-vesting holding restriction, upper limit	22.00%
Maximum employee contribution to purchase company stock	$ 10,000
Discount rate used to determine the purchase price	15.00%
Repurchase program, number of additional shares authorized for repurchase					10,000,000		10,000,000	10,000,000
Shares remaining for repurchase under authorization						827,443		10,000,000