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Per Share Information - Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
AMOUNTS ATTRIBUTABLE TO COMMON STOCK:        
Net income from continuing operations $ 70,237 $ 57,918 $ 142,318 $ 103,716
Net income from discontinued operations   7,620   7,529
Net income attributable to common stock $ 70,237 $ 65,538 $ 142,318 $ 111,245
WEIGHTED AVERAGE SHARES:        
Weighted average shares outstanding for basic earnings per share 214,314 212,987 213,833 212,244
Effect of dilutive stock options 54 100 53 98
Weighted average shares outstanding for diluted earnings per share 214,368 213,087 213,886 212,342