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Consolidated Quarterly Financial Data (unaudited) - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, cost of acquired entity, transaction costs |  | $ 500,000 |  | $ 100,000 | $ 200,000 | $ 600,000 | $ 2,400,000 | $ 13,600,000 | $ 1,700,000
Reversal of income tax valuation allowance against net deferred tax assets | $ 0 | $ 59,887,000 | $ 0 |  |  |  |  |  |

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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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- Definition The amount of the change in the period in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 + Details
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