Fair Value Measurement - Reconciliation of the Beginning and Ending Level 3 Net Liabilities (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2015 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Accretion of contingent earnout consideration (included within other expense, net)	$ (1,114)
Significant Unobservable Inputs (Level 3) [Member] \| Zero2Ten and Branchbird Contingent Earnout Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Accretion of contingent earnout consideration (included within other expense, net)	1,114
Ending balance	6,909
Significant Unobservable Inputs (Level 3) [Member] \| Zero2Ten and Branchbird Contingent Earnout Consideration [Member] \| Branchbird [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Initial estimate of fair value related to Branchbird/Zero2Ten contingent earnout consideration	1,428
Significant Unobservable Inputs (Level 3) [Member] \| Zero2Ten and Branchbird Contingent Earnout Consideration [Member] \| Zero2Ten [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Initial estimate of fair value related to Branchbird/Zero2Ten contingent earnout consideration	$ 4,367

Amount of increase (decrease) in the value of right to a contingent consideration asset.

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)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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- Definition

Fair value of contingent consideration in a business combination that is classified in shareholders' equity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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