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Goodwill and Intangible Assets, Net - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	$ 51,889,000			$ 51,889,000		$ 51,889,000
Goodwill, Impairment Loss			$ 0			$ 0
Weighted average remaining useful life				3 years 7 months 6 days
Amortization of intangible assets	$ 400,000	$ 400,000		$ 1,200,000	$ 1,200,000

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 30



-Section 45



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274



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X

- Definition

Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



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-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



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-Paragraph 2



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-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



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-Publisher FASB



-Name Accounting Standards Codification



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