Allocation of Purchase Price for Acquisitions and Enterprise Value of Channel Intelligence (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Net assets acquired:
Goodwill	$ 90,466	$ 90,466
Superior Access
Net assets acquired:
Goodwill	2,654
Customer lists (5-11 year life)	4,000
Trademarks, trade names and domain names (5-11 year life)	1,100
Technology (5 year life)	1,300
Non-compete agreements (3 year life)
Other net assets (liabilities)	(343)
Purchase price allocation assets acquired	$ 8,711

Amount of net tangible assets (liabilities) acquired as part of a business combination.

No definition available.

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- Definition

The amount of acquisition cost of business combination allocated to identifiable customer relationship intangible assets that will be amortized.

+ References

No definition available.

+ Details

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- Details

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- Definition

The amount of acquisition cost of business combination allocated to identifiable noncompete agreement intangible assets that will be amortized.

+ References

No definition available.

+ Details

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- Definition

The amount of acquisition cost of business combination allocated to identifiable technology intangible assets that will be amortized.

+ References

No definition available.

+ Details

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- Definition

The amount of acquisition cost of business combination allocated to identifiable trademark, trade name and domain name intangible assets that will be amortized.

+ References

No definition available.

+ Details

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- Definition

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

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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

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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