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Intangible Assets - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Finite Lived Intangible Assets [Line Items] | ||||
| Amortization Expenses | $ 300,000 | $ 100,000 | $ 500,000 | $ 300,000 |
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Trade Names
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| Finite Lived Intangible Assets [Line Items] | ||||
| Weighted average useful lives of acquired assets | 5 years | |||
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Noncompete Agreements
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| Finite Lived Intangible Assets [Line Items] | ||||
| Weighted average useful lives of acquired assets | 5 years | |||
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Customer Relationships
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| Finite Lived Intangible Assets [Line Items] | ||||
| Weighted average useful lives of acquired assets | 10 years 7 months 6 days | |||
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Series of Individually Immaterial Business Acquisitions
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| Finite Lived Intangible Assets [Line Items] | ||||
| Intangible assets | 8,426,000 | 8,426,000 | ||
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Series of Individually Immaterial Business Acquisitions | Trade Names
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| Finite Lived Intangible Assets [Line Items] | ||||
| Intangible assets | 900,000 | 900,000 | ||
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Series of Individually Immaterial Business Acquisitions | Noncompete Agreements
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| Finite Lived Intangible Assets [Line Items] | ||||
| Intangible assets | 300,000 | 300,000 | ||
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Series of Individually Immaterial Business Acquisitions | Customer Relationships
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| Finite Lived Intangible Assets [Line Items] | ||||
| Intangible assets | $ 7,200,000 | $ 7,200,000 | ||