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Senior Notes - Additional Information (Detail) (USD $) | 12 Months Ended |  | 1 Months Ended |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Senior Convertible Notes Due 2040 [Member] | Dec. 31, 2011 Senior Convertible Notes Due 2040 [Member] | Jun. 30, 2012 4.625% senior unsecured notes [Member] | Dec. 31, 2012 4.625% senior unsecured notes [Member] | Nov. 30, 2012 4.625% senior unsecured notes [Member] | Dec. 31, 2012 Senior Unsecured Notes [Member] | Dec. 31, 2011 Senior Unsecured Notes [Member] | Dec. 31, 2010 Senior Unsecured Notes [Member] | Dec. 31, 2011 Senior Convertible Notes [Member] | Dec. 31, 2010 Senior Convertible Notes [Member] | Dec. 31, 2012 Senior Convertible Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note principal amount | $ 450,000,000 |  |  |  |  | $ 300,000,000 |  | $ 150,000,000 |  |  |  | $ 529,509,000 |  | $ 350,000,000
Interest rate of senior notes |  |  |  |  |  |  | 4.625% |  |  |  |  |  |  |
Notes issued |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |
Discount rate of Senior notes |  |  |  |  |  | 98.104% |  |  |  |  |  |  |  |
Premium rate of Senior notes |  |  |  |  |  |  |  | 109.223% |  |  |  |  |  |
Conversion price |  |  |  | $ 15.76 | $ 16.19 |  |  |  |  |  |  |  |  |
Conversion price per share greater than applicable trading day |  |  |  | 125.00% |  |  |  |  |  |  |  |  |  |
Trading days, minimum |  |  |  | 20 days |  |  |  |  |  |  |  |  |  |
Trading days, maximum |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |
Remaining amortization periods for debt discount |  |  |  | 34 months |  |  |  |  |  |  |  |  |  |
Aggregate Extinguishment of Debt, Amount | 60,000,000 | 36,100,000 | 259,100,000 |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on debt retirement, net | (13,495,000) | (89,000) | 485,000 |  |  |  |  |  | (13,500,000) | (100,000) | 100,000 |  |  |
Senior convertible notes repurchased |  |  |  |  |  |  |  |  |  |  |  | 19,400,000 | 140,600,000 |
Debt instrument - impact of convertible debt accretion |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 4,900,000 |
Average interest rate | 5.80% | 5.90% |  |  |  |  |  |  |  |  |  |  |  |
Notes issued which may not be redeemed prior to maturity | $ 82,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant compliance | The Company was in compliance with all of the financial and other covenants. | The Company was in compliance with all of the financial and other covenants. |  |  |  |  |  |  |  |  |  |  |  |

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