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Per Share Information - Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
AMOUNTS ATTRIBUTABLE TO COMMON STOCK:    
Net income attributable to common stock $ 54,408 $ 72,081
WEIGHTED AVERAGE SHARES:    
Weighted average shares outstanding for basic earnings per share 219,033 213,453
Effect of dilutive stock options 42 59
Weighted average shares outstanding for diluted earnings per share 219,075 213,512