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Nature of Business and Basis of Presentation - Additional Information (Detail) (USD $) | 6 Months Ended |  |  |  | 1 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011 | Jul. 12, 2013 Subsequent Event
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 149,426,000 | $ 260,242,000 | $ 250,255,000 | $ 116,602,000 |
Net proceeds from public offering |  |  |  |  | $ 121,100,000
Convertible senior notes, earliest redemption date | Jan. 19, 2017 |  |  |  |

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