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Reconciliation Between Basic and Diluted Weighted Average Shares Outstanding (Detail) (USD $)
In Thousands, except Per Share data, 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
Earnings Per Share [Abstract]                      
Net income $ 47,225 $ 57,749 $ 52,007 $ 60,131 $ 42,637 $ 49,504 $ 42,471 $ 49,433 $ 217,112 $ 184,045 $ 163,995
Net income attributable to unvested awarded performance stock                 (5,446) (5,313) (5,099)
Net income attributable to common shares                 $ 211,666 $ 178,732 $ 158,896
Weighted average basic number of common shares outstanding                 144,662 143,507 143,029
Less unvested awarded performance stock included in weighted average basic share outstanding                 (3,629) (4,143) (4,447)
Weighted average number of common shares outstanding for basic earnings per common share                 141,033 139,364 138,582
Dilutive effect of stock options                 1,591 2,646 1,682
Weighted average number of shares outstanding                 142,624 142,010 140,264
Basic $ 0.32 $ 0.40 $ 0.36 $ 0.42 $ 0.30 $ 0.34 $ 0.30 $ 0.34 $ 1.50 $ 1.28 $ 1.15
Diluted $ 0.32 $ 0.39 $ 0.36 $ 0.41 $ 0.29 $ 0.34 $ 0.29 $ 0.34 $ 1.48 $ 1.26 $ 1.13