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Per Share Information - Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
AMOUNTS ATTRIBUTABLE TO COMMON STOCK:                      
Net income from continuing operations $ 166,697 $ 92,906 $ 70,237 $ 72,081 $ 102,350 $ 83,628 $ 57,918 $ 45,798 $ 401,921 $ 289,694 $ 118,511
Net income from discontinued operations                   16,935 14,004
Net income attributable to common stock $ 166,697 $ 92,906 $ 70,237 $ 72,081 $ 98,986 $ 96,398 $ 65,538 $ 45,707 $ 401,921 $ 306,629 $ 132,515
WEIGHTED AVERAGE SHARES:                      
Weighted average shares outstanding for basic earnings per share                 214,929 212,777 212,648
Effect of dilutive stock options                 49 58 126
Effect of shares in escrow                     394
Weighted average shares outstanding for diluted earnings per share                 214,978 212,835 213,168