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Earnings and Dividends Per Share - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Senior convertible notes due 2040 [Member]
Dec. 31, 2013
Stock options [Member]
Dec. 31, 2012
Stock options [Member]
Dec. 31, 2011
Stock options [Member]
Mar. 31, 2011
Warrants [Member]
Dec. 31, 2011
Warrants [Member]
Dec. 31, 2009
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                    
Restricted shares excluded from basic average shares outstanding 1,800,000 2,400,000 1,900,000              
Options to purchase common shares not included in computation of diluted EPS         2,700,000 2,600,000 2,700,000      
Senior convertible notes Convertible to common shares price       $ 15.33            
Conversion price as a percentage of common share price       125.00%            
Warrants to purchase common shares                   10,000,000
Exercise of warrants for common stock shares               10,000,000    
Warrants to purchase common shares included in the computation of diluted EPS 0 0 1,194,000           10,000,000