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Employee Savings Plan - Additional Information (Detail) (USD $) | 12 Months Ended | 15 Months Ended
--- | --- | ---
Dec. 31, 2012 Y | Dec. 31, 2011 | Dec. 31, 2010 | Jul. 04, 2010
Employee Benefit Plans [Line Items] |  |  |  |
Minimum age to be eligible to defined contribution plan | 21 |  |  |
Maximum part of pre tax salary which employee can contribute to define contribution plan | 25.00% |  |  |
Company contribution per dollar of employee contribution | $ 0.50 |  |  | $ 0.25
Maximum contribution by company expressed as percentage of employee pre-tax salary | 3.00% |  |  | 1.50%
Company contributions vest at end of two years | 20.00% |  |  |
Company contributions vest at end of three years | 40.00% |  |  |
Company contributions vest at end of four years | 60.00% |  |  |
Company contributions vest at end of five years | 100.00% |  |  |
Defined Contribution Plan, Cost Recognized | $ 1,362,000 | $ 1,218,000 | $ 776,000 |

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- Details
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- Definition Minimum age to be eligible to defined contribution plan. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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