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Fair Value Measurements - Additional Information (Detail) - USD ($) | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Measurements, Inter-transfers between Levels | $ 0 | $ 0
Minimum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Business Combination Contingent Consideration Liability Extended Term | 3 years |
Maximum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Business Combination Contingent Consideration Liability Extended Term | 6 years |

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