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Stockholders' Equity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 1 Months Ended
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Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Apr. 30, 2014 | Oct. 31, 2014 Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend declared and paid per share | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.15 | $ 0.15 | $ 0.15 |  |  |  |
Aggregate dividend declared for the year |  |  |  |  |  |  | $ 9,100,000 | $ 9,400,000 |  |
Dividend declared per share | $ 0.16 |  |  | $ 0.15 |  |  | $ 0.48 | $ 0.45 |  | $ 0.16
Dividend payable date |  |  |  |  |  |  |  |  |  | Dec. 17, 2014
Dividend payable record date |  |  |  |  |  |  |  |  |  | Dec. 03, 2014
Authorized to purchase of common stock under the stock repurchase program | 410,000,000 |  |  |  |  |  | 410,000,000 |  | 25,000,000 |
Repurchase of common Stock |  |  |  |  |  |  | 1.8 |  |  |
Cumulative aggregate cost of repurchase of common stock |  |  |  |  |  |  | 66,600,000 |  |  |
Cumulative repurchase of common stock | 14.2 |  |  |  |  |  | 14.2 |  |  |
Aggregate cost of repurchase of common stock |  |  |  |  |  |  | $ 395,600,000 |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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