Acquisitions Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jun. 05, 2015	Apr. 14, 2015
Creative Circle [Member]
Business Acquisition [Line Items]
Business Acquisition Contingent Consideration At Fair Value Accrued Earn-Out	$ 17,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 4,840
Business Combination, Acquired Receivables, Description	34386
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	$ 3,865
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	5,077
BusinessCombinationRecognizedGoodwill	361,746
Business Combination, Goodwill Recognized, Description	194,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	651
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	605,065
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	12,072
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	12,072
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 592,993
LabResource [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		$ 187
Business Combination, Acquired Receivables, Description		1643
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets		$ 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		12
BusinessCombinationRecognizedGoodwill		6,104
Business Combination, Goodwill Recognized, Description		7,528
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		15,474
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities		1,482
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other		1,882
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		3,364
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		$ 12,110