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Treasury Stock - Additional Information (Detail) (USD $) | 0 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 08, 2013 | Nov. 19, 2012 | Jun. 30, 2013 | Jun. 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 |  |  | 265,340,000 | 22,086,000 |
Treasury shares issued |  |  | 126,390 |  |
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 |  |  | 50,559 |  |
Common stock repurchased, average cost (in dollars per share) |  |  | $ 42.74 |  |
Treasury stock, shares |  |  | 24,106,873 |  |
Common Stock Repurchase Progam (excluding Dutch Auction purchases) |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock repurchase, remaining authorized amount |  |  | 85,800,000 |  |
Repurchases of common stock (in shares) |  |  | 305,562 |  |
Average cost per share of stock acquired (in dollars per share) |  |  | $ 46.94 |  |
Repurchase of common stock |  |  | $ 14,300,000 |  |

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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 Amount per share assigned to the consideration received for shares issued. + 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: 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 The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 7 -Subparagraph b -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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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