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Nature of Business and Basis of Presentation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |
Cash and cash equivalents | $ 201,780 | $ 260,242 | $ 245,822 | $ 116,602
Convertible senior notes, earliest redemption date | Jan. 19, 2017 |  |  |

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