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Treasury Stock - Additional Information (Detail) (USD $) | 0 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 08, 2013 | Nov. 19, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock repurchase, remaining authorized amount |  |  |  |  | $ 350,100,000
Common stock purchased through modified dutch auction tender offer - in shares | 5,524,861 |  |  |  |
Common stock purchased through modified dutch auction tender offer - price per share | $ 45.25 |  |  |  |
Common Stock Purchased Through Modified Dutch Auction Tender Offer Value | 250,000,000 |  |  |  |
Dollar amount of common stock intended to purchase through modified dutch auction tender offer |  | 250,000,000 |  |  |
Common stock purchased through modified dutch auction tender offer - Fees and expenses incurred | 1,000,000 |  |  |  |
Repurchase of common stock |  |  | 267,607,000 | 33,863,000 |
Treasury shares issued |  |  | 149,304 |  |
Issuance of treasury shares, average cost per share |  |  | $ 6.63 |  |
Shares repurchased to satisfy employee withholding tax requirements resulting from certain restricted stock units becoming vested |  |  | 58,812 |  |
Common stock repurchased, average cost (in dollars per share) |  |  | $ 43.55 |  |
Treasury stock, shares |  |  | 24,140,804 |  |
Common Stock Repurchase Progam (excluding Dutch Auction purchases) |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock repurchase, remaining authorized amount |  |  | 83,500,000 |  |
Repurchases of common stock (in shares) |  |  | 354,154 |  |
Average cost per share of stock acquired (in dollars per share) |  |  | $ 46.90 |  |
Repurchase of common stock |  |  | $ 16,600,000 |  |

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- Definition Common Stock Intended to Purchase Through Modified Dutch Auction Tender Offer, Amount + References No definition available. + Details
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- Definition Common Stock Purchased Through Modified Dutch Auction Tender Offer, Price Per Share + References No definition available. + Details
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- Definition Common Stock Purchased Through Modified Dutch Auction Tender Offer, Shares + References No definition available. + Details
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- Definition Common Stock Purchased Through Modified Dutch Auction Tender Offer, Value + References No definition available. + Details
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- Definition Fees and Expenses Incurred Related to Modified Dutch Auction Tender Offer + References No definition available. + Details
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- Definition Stock Repurchased During Period, Average Price + References No definition available. + Details
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- Details
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- Definition Amount per share or per unit assigned to the consideration received of equity securities issued for development stage entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 915 -SubTopic 215 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6472370&loc=d3e38297-110927 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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