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Concentration of Credit Risk	3 Months Ended
Concentration of Credit Risk	Mar. 31, 2017
Risks and Uncertainties [Abstract]
Concentration of Credit Risk	Concentration of Credit Risk The Company maintains cash depository accounts with several financial institutions worldwide and is exposed to credit risk related to potential inability to access liquidity in financial institutions where its cash and cash equivalents are concentrated. The Company has not historically incurred any losses with respect to these balances and believes that they bear minimal credit risk. As of March 31, 2017, the amount of cash and cash equivalents held outside the Unites States by the Company's foreign subsidiaries was $79.4 million, or 48.3% of the total consolidated cash and cash equivalents balance. No single customer accounted for greater than 10% total consolidated net service revenue for the three months ended March 31, 2017 or March 31, 2016. As of March 31, 2017 and December 31, 2016, no single customer accounted for greater than 10% of billed and unbilled trade accounts receivable balances.