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Equity - Additional Information (Detail) (USD $) | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Mar. 31, 2013 Awards issued prior to 2006 Period 1 | Mar. 31, 2013 Awards issued prior to 2006 Period 2 | Mar. 31, 2013 Awards issued prior to 2006 Period 3 | Mar. 31, 2013 Awards issued during and after 2006 | Jan. 31, 2009 8.5% Convertible perpetual preferred stock | Mar. 31, 2013 8.5% Convertible perpetual preferred stock | Mar. 31, 2012 8.5% Convertible perpetual preferred stock | Dec. 31, 2009 6.0% Convertible perpetual preferred stock | Mar. 31, 2013 6.0% Convertible perpetual preferred stock | Mar. 31, 2012 6.0% Convertible perpetual preferred stock | Nov. 30, 2010 7.0% Convertible perpetual preferred stock | Mar. 31, 2013 7.0% Convertible perpetual preferred stock | Mar. 31, 2012 7.0% Convertible perpetual preferred stock | Mar. 31, 2013 Treasury Stock | Mar. 31, 2012 Treasury Stock | Mar. 31, 2013 Stockholder Rights Plan Series A Junior Participating Preferred Stock Right | Mar. 31, 2013 Former President and Chief Operating Officer
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares designated (in shares) | 7,700,000 | 7,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  | 8.50% | 8.50% | 8.50% | 6.00% | 6.00% | 6.00% | 7.00% | 7.00% | 7.00% |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  |  |  |  | $ 100.00 |  |  | $ 100.00 |  |  | $ 100.00 |  |  |  |  |  |
Preferred stock, number of common stock shares initially issuable upon conversion (in shares) |  |  |  |  |  |  |  | 12.4805 |  |  | 9.2115 |  |  | 12.8791 |  |  |  |  |  |
Preferred stock, annual dividend per share (in dollars per share) |  |  |  |  |  |  |  | $ 8.50 |  |  | $ 6.00 |  |  | $ 7.00 |  |  |  |  |  |
Preferred stock, conversion start date |  |  |  |  |  |  |  | Feb. 20, 2014 |  |  | Dec. 21, 2014 |  |  | Nov. 20, 2015 |  |  |  |  |  |
Preferred stock, conversion term |  |  |  |  |  |  |  | Each share of 8.5% convertible perpetual preferred stock has a liquidation preference of $100.00 and is convertible at the holder’s option at any time initially into approximately 12.4805 shares of the Company’s common stock, subject to customary adjustments in certain circumstances. Each holder of the convertible perpetual preferred stock is entitled to an annual dividend of $8.50 per share to be paid semi-annually in cash, common stock or a combination thereof, at the Company’s election. The 8.5% convertible perpetual preferred stock is not redeemable by the Company at any time. After February 20, 2014, 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. |  |  | Each share of the 6.0% convertible perpetual preferred stock has a liquidation preference of $100.00 and is entitled to an annual dividend of $6.00 payable semi-annually in cash, common stock or any combination thereof, at the Company’s election. The 6.0% convertible perpetual preferred stock is not redeemable by the Company at any time. Each share is initially convertible into approximately 9.2115 shares of the Company’s common stock, at the holder’s option, subject to customary adjustments in certain circumstances. On December 21, 2014, all outstanding shares of the 6.0% convertible preferred stock will be converted automatically into shares of the Company’s common stock at the then-prevailing conversion price as long as all dividends accrued at that time have been paid. |  |  | Each share of the 7.0% convertible preferred stock has a liquidation preference of $100.00 per share and became convertible at the holder’s option on February 15, 2011, initially into approximately 12.8791 shares of the Company’s common stock, subject to customary adjustments in certain circumstances. The annual dividend on each share of the 7.0% convertible preferred stock is $7.00 payable semi-annually, in cash, common stock or a combination thereof, at the Company’s election beginning on May 15, 2011. The 7.0% convertible perpetual preferred stock is not redeemable by the Company at any time. After November 20, 2015, the Company may cause all outstanding shares of the 7.0% convertible perpetual preferred stock to convert automatically into common stock at the then-prevailing conversion rate if certain conditions are met. |  |  |  |  |  |
Number of Rights issued per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Right expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 29, 2013 |
Purchase of treasury stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 | 800,000 |  |
Purchase of treasury stock | $ (11,216,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (11,216,000) | $ (6,400,000) |  |
Retirement of treasury stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 | 800,000 |  |
Retirement of treasury stock | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,216,000 | 6,400,000 |  |
Stockholder settlement gross |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital - stockholder receivable | (5,000,000) | (5,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted common stock under incentive compensation plans, vesting period (in years) |  |  |  | 1 year | 4 years | 7 years | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 18,900,000 |  | 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,600,000
Stock based compensation, capitalized | $ 1,600,000 |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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