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Equity - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Equity Disclosure |  |  |  |  |
Preferred stock, shares authorized (in shares) | 50,000,000 | 50,000,000 |  | 50,000,000 |
Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |  | $ 0.001 |
Preferred stock, shares designated (in shares) | 7,700,000 | 7,700,000 |  | 7,700,000 |
Preferred stock, conversion terms |  |  |  | Each outstanding share of convertible perpetual preferred stock is convertible at the holder’s option at any time into shares of the Company’s common stock at the specified conversion rate, subject to customary adjustments in certain circumstances. Each holder is entitled to an annual dividend payable semi-annually in cash, common stock or a combination thereof, at the Company’s election. The convertible perpetual preferred stock is not redeemable by the Company at any time. After the specified conversion date, the Company may cause all outstanding shares of the convertible perpetual preferred stock to convert automatically into common stock at the then-prevailing conversion rate if certain conditions are met. |
Purchase of treasury stock |  |  |  | $ (29,661,000) |
Retirement of treasury stock |  |  |  | 0 |
Stockholder settlement gross |  | 5,000,000 |  |  |
Additional paid-in capital—stockholder receivable | (5,000,000) | (5,000,000) |  | (5,000,000) |
Restricted common stock under incentive compensation plans, vesting period (in years) |  |  |  | 4 years |
Stock-based compensation | 6,800,000 |  | 9,100,000 | 77,500,000 | 30,700,000
Stock-based compensation, capitalized | 1,300,000 |  | 1,800,000 | 4,300,000 | 5,700,000
8.5% Convertible perpetual preferred stock |  |  |  |  |
Equity Disclosure |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 8.50% | 8.50%
6.0% Convertible perpetual preferred stock |  |  |  |  |
Equity Disclosure |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 6.00% | 6.00%
7.0% Convertible perpetual preferred stock |  |  |  |  |
Equity Disclosure |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 7.00% | 7.00%
Treasury Stock |  |  |  |  |
Equity Disclosure |  |  |  |  |
Purchase of treasury stock (in shares) |  |  |  | 5,600,000 | 1,500,000
Purchase of treasury stock |  |  |  | (29,661,000) | (11,100,000)
Retirement of treasury stock (in shares) |  |  |  | 5,600,000 | 1,500,000
Retirement of treasury stock |  |  |  | 29,661,000 | 11,100,000
Stockholder Rights Plan | Series A Junior Participating Preferred Stock |  |  |  |  |
Equity Disclosure |  |  |  |  |
Number of Rights issued per common share | 1 |  |  | 1 |
Right expiration date |  |  |  | Apr. 29, 2013 |
Separation of Former Executives |  |  |  |  |
Equity Disclosure |  |  |  |  |
Stock-based compensation |  |  |  | $ 48,500,000 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Specific terms relevant to convertibility. Includes class of preferred stock and number of shares convertible into, exercise (or conversion) price or rates, dates relevant to conversion timing and events relevant to conversion. Describe also any beneficial conversion features. where convertible preferred stock with a nondetachable conversion feature is in-the-money at commitment date. For contingently convertible preferred stock, discuss the circumstances of the contingency, including the events or changes in circumstance that would cause the contingency to be met and any of the significant features necessary to understand the conversion rights and the timing of those rights. Include also an events or changes in circumstance, if any, that could adjust or change the contingency, conversion price, or number of shares, including significant terms of those changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingently Convertible Instruments -URI http://asc.fasb.org/extlink&oid=6508575 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 + Details
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