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Significant Agreements	12 Months Ended
Significant Agreements	Dec. 31, 2011
Significant Client Agreements [Abstract]
Significant Agreements	Significant Agreements During the year ended December 31, 2010, an ancillary service provider terminated its agreement with the Company to provide laboratory services in Texas to clients of the Company on an “as needed” basis. Services provided by the provider accounted for approximately 3% of the Company’s net revenues in 2010. The Company's second largest client continues to transition its payors and employer groups to alternative network options as a result of a business combination. While the Company has an enforceable contract in effect through May 2012, the client continues its transition, negatively impacting the claims volume and revenue generated from the account. The Company anticipates the transition will continue throughout 2012 and will be complete by December 31, 2012.