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Related-Party Transactions - 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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Former Employee [Member]
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| Related Party Transaction [Line Items] | ||||
| Number of incentive units purchased | 2,605 | |||
| Purchase price per incentive unit | $ 260.21 | |||
| Incentive units purchased | $ 700,000 | |||
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Chief Sales Officer [Member]
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| Related Party Transaction [Line Items] | ||||
| General partnership ownership interest in related party, percentage | 0.01% | 0.01% | ||
| Limited partnership interest in related party, percentage | 10.49% | 10.49% | ||
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Chief Sales Officer [Member] | Minimum [Member]
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| Related Party Transaction [Line Items] | ||||
| Payments for rent | 100,000 | 100,000 | ||
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Chief Sales Officer [Member] | Maximum [Member]
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| Related Party Transaction [Line Items] | ||||
| Payments for rent | 200,000 | 200,000 | ||
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Advantage [Member]
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| Related Party Transaction [Line Items] | ||||
| Administrative expenses | $ 31,000 | $ 3,000 | $ 39,000 | $ 8,000 |