Goodwill and Purchased Intangible Assets - Goodwill (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Vialis AG Acquisition	Jan. 10, 2013 Vialis AG Acquisition	Dec. 31, 2013 ChemSW Acquisition	Sep. 03, 2013 ChemSW Acquisition	Dec. 31, 2013 Qumas acquisition	Dec. 09, 2013 Qumas acquisition	Dec. 31, 2013 Aegis Acquisition	Oct. 23, 2012 Aegis Acquisition
Goodwill [Roll Forward]
Balance at December 31, 2012	$ 123,670		$ 810		$ 5,905		$ 24,388		$ 22,516
Goodwill acquired		810		5,905		24,388
Goodwill measurement period adjustments related to the Aegis Acquisition								3,556
Effect of foreign exchange	178
Balance at December 31, 2013	$ 158,507		$ 810		$ 5,905		$ 24,388		$ 22,516