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Net Income Per Share - Reconciliation between Basic and Diluted Weighted Average Shares Outstanding (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Earnings Per Share [Abstract] |  |  |  |
Net income | $ 67,427 | $ 68,331 | $ 185,383 | $ 182,501
Net income attributable to unvested awarded performance stock | (1,565) | (1,681) | (4,370) | (4,604)
Net income attributable to common shares | $ 65,862 | $ 66,650 | $ 181,013 | $ 177,897
Weighted average number of common shares outstanding - basic (in shares) | 140,955 | 144,469 | 141,517 | 144,909
Less unvested awarded performance stock included in weighted average number of common shares outstanding - basic (in shares) | (3,271) | (3,554) | (3,336) | (3,656)
Weighted average number of common shares outstanding for basic earnings per common share (in shares) | 137,684 | 140,915 | 138,181 | 141,253
Dilutive effect of stock options (in shares) | 2,357 | 2,049 | 2,265 | 1,849
Weighted average number of shares outstanding - diluted (in shares) | 140,041 | 142,964 | 140,446 | 143,102
Basic (in dollars per share) | $ 0.48 | $ 0.47 | $ 1.31 | $ 1.26
Diluted (in dollars per share) | $ 0.47 | $ 0.47 | $ 1.29 | $ 1.24

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- Definition This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 61A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780137-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Participating Security -URI http://asc.fasb.org/extlink&oid=6519812 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 59A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780131-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 68B -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5498026-109256 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1500-109256 + Details
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