Employee Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Compensation and Retirement Disclosure [Abstract]
Maximum percentage of annual compensation contributed by the participant	60.00%
Common stock shares remained available for grant	854
Matching contributions to the Vertex 401(k) Plan:
Discretionary matching contributions during the year ended December 31,	$ 10,261	$ 8,619	$ 6,552
Shares issued during the year ended December 31,	242	183	174
Shares issuable as of the year ended December 31,	53	62	42

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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- Definition

Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

+ References

No definition available.

+ Details

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- Definition

Represents the number of shares available for grant under 401(k) retirement plan during the period.

+ References

No definition available.

+ Details

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- Definition

The maximum percentage of compensation that can be contributed by employees into the 401(k) retirement plan.

+ References

No definition available.

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- Definition

Represents shares issuable under 401(k) retirement plan as of period end.

+ References

No definition available.

+ Details

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