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401(K) and Profit-Sharing Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contribution in profit sharing plan, percentage | 3.00% |  |
Employer contribution in profit sharing plan | $ 2.4 | $ 2.7 | $ 1.5

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- Definition Employer contribution in profit sharing plan. + References No definition available. + Details
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- Definition Percentage of defined benefit plan contributions by employer. + References No definition available. + Details
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- Details
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Balance Type: | na
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