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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Matching contributions to the Vertex 401(k) Plan
The Company declared matching contributions to the Vertex 401(k) Plan as follows:
 
2012
2011
2010
 
(in thousands)
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