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Capital Stock - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Nov. 23, 2010 | Nov. 19, 2012 | Nov. 19, 2011 | Nov. 23, 2010 | Nov. 08, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Feb. 08, 2013 Subsequent Event | Feb. 08, 2013 Subsequent Event Co- Chairman Of Board Of Directors
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  | 200,000,000 | 200,000,000 |  |  |
Common stock, par value |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |
Preferred stock, shares authorized |  |  |  |  |  | 10,000,000 |  |  |  |
Preferred stock, par value |  |  |  |  |  | $ 0.01 |  |  |  |
Common stock authorized for repurchase |  |  | $ 100,000,000 |  |  |  | $ 300,000,000 |  |  |
Repurchases of common stock |  |  |  |  |  | 805,346 | 441,416 |  |  |
Common stock repurchased, purchase price per share |  |  |  |  |  | $ 42.35 | $ 35.79 |  |  |
Common stock repurchased, total purchase price |  |  |  |  |  | 34,109,000 | 15,797,000 | 247,825,000 |  |
Common stock repurchase, remaining authorized amount |  |  |  |  |  | 350,100,000 |  |  |  |
Treasury shares issued |  |  |  |  |  | 132,846 | 374,071 | 163,428 |  |
Average cost for restricted stock units |  |  |  |  |  | $ 6.63 | $ 6.63 | $ 6.63 |  |
Shares repurchased to satisfy employee withholding tax requirements resulting from certain restricted stock units becoming vested |  |  |  |  |  | 43,874 | 142,080 | 51,038 |  |
Common stock repurchased, average cost |  |  |  |  |  | $ 42.64 | $ 36.58 | $ 28.82 |  |
Treasury stock, shares |  |  |  |  |  | 18,352,281 | 17,635,907 |  |  |
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 - in shares |  |  |  |  | 5,035,971 |  |  |  | 5,524,861 | 515,806
Common stock purchased through modified dutch auction tender offer - price per share |  |  |  |  | $ 34.75 |  |  |  | $ 45.25 | $ 45.25
Common stock purchased through modified dutch auction tender offer - total purchase price in dollars |  |  |  |  | 175,000,000 |  |  |  | 250,000,000 | 23,300,000
Common stock purchased from stockholders under stock purchase agreement - in shares |  |  |  | 2,071,509 |  |  |  |  |  |
Common stock purchased from stockholders under stock purchase agreement - price per share |  |  |  | $ 34.75 |  |  |  |  |  |
Common stock purchased from stockholders under stock purchase agreement - total purchase price in dollars |  |  |  | 72,000,000 |  |  |  |  |  |
Common stock purchased from stockholders under stock purchase agreement and through tender offer - in shares | 7,107,480 |  |  |  |  |  |  |  |  |
Common stock purchased from stockholders under stock purchase agreement and through tender offer- price per share | $ 34.75 |  |  |  |  |  |  |  |  |
Common stock purchased from stockholders under stock purchase agreement and through tender offer - total purchase price in dollars | $ 247,000,000 |  |  |  |  |  |  |  |  |

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- Definition Common Stock Purchased from Stockholders under Stock Purchase Agreement and Through Modified Dutch Auction Tender Offer, Price Per Share + References No definition available. + Details
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- Definition Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -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 FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + 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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