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Investments and Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Acquisition payable	$ 2,449	$ 2,449	$ 1,757
Acquisition contingent payment	172	693
Level 3 [Member]
Schedule of Held-to-maturity Securities [Line Items]
Acquisition payable	2,449	2,449
Boost Shareholders [Member]
Schedule of Held-to-maturity Securities [Line Items]
Acquisition contingent payment	$ 172	$ 693

X

- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 30



-Section 50



-Paragraph 4



-Subparagraph (a)(1)



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- Definition

Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 20



-Section 50



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