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Schedule of Calculation of Numerator and Denominator in Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 304,592 | $ 156,966 | $ 162,330
(Loss) income from discontinued operations, net of taxes |  |  | (663) | [1] | (2,739) | [1] | (355) | [1] | 150 | [1] | 99 | [1] | (150) | [1] | (304) | [1] | (3,757) | (205) | 180
Net income | 47,471 | [1] | 51,843 | [1] | 20,429 | [1] | 181,092 | [1] | 45,408 |  | 42,339 |  | 37,334 |  | 31,680 |  | 300,835 | 156,761 | 162,510
Weighted average shares and assumed conversions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 111,250 | 100,623 | 105,535
Income from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.77 | $ 1.58 | $ 1.55
(Loss) income from discontinued operations, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.03) |  |
Net income | $ 0.41 | [2] | $ 0.45 | [2] | $ 0.19 | [2] | $ 1.81 | [2] | $ 0.46 |  | $ 0.42 |  | $ 0.37 |  | $ 0.32 |  | $ 2.74 | $ 1.58 | $ 1.55
Income from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.73 | $ 1.56 | $ 1.54
(Loss) income from discontinued operations, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.03) |  |
Net income | $ 0.41 | [2] | $ 0.44 | [2] | $ 0.19 | [2] | $ 1.78 | [2] | $ 0.45 |  | $ 0.42 |  | $ 0.37 |  | $ 0.32 |  | $ 2.70 | $ 1.56 | $ 1.54
Basic Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 304,592 | 156,966 | 162,330
(Loss) income from discontinued operations, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,757) | (205) | 180
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,835 | 156,761 | 162,510
Weighted average common shares outstanding, basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,617 | 99,545 | 104,736
Diluted Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 304,592 | 156,966 | 162,330
(Loss) income from discontinued operations, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,757) | (205) | 180
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,835 | $ 156,761 | $ 162,510
Weighted average common shares outstanding, diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,617 | 99,545 | 104,736
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,279 | 864 | 603
Restricted stock based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 354 | 214 | 196
[1] | The amounts presented for the first two quarters of 2013 and the four quarters of 2012 are not equal to the same amounts previously reported in the respective reports on Form 10-Q and Form 10-K for each period as a result of discontinued operations. Below is a reconciliation to the previously reported amounts in Form 10-Q.
[2] | The earnings per share amounts in the first quarter of 2013 were favorably impacted by the net tax benefit resulting from the revaluation of certain deferred tax assets and liabilities associated with the REIT conversion effective January 1, 2013. Additionally, the earnings per share amounts in the second quarter of 2013 were negatively impacted by $36.3 million of expenses associated with debt refinancing transactions.

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