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Fair Value Measurements - Additional Information (Detail) (USD $) | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Fair Value Disclosures [Abstract] |  |
Fair Value Measurements, Inter-transfers between Levels | $ 0 | $ 0
Business Combination Contingent Consideration Liability Extended Term | 3 years |

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- Definition Business combination contingent consideration liability extended term. + References No definition available. + Details
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- Details
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