Subsequent Events (Details) - Subsequent Event [Member] - USD ($) $ in Millions	Oct. 30, 2015	Oct. 06, 2015
Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Debt instrument, term	5 years
October 2015 Line of Credit [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Current borrowing capacity	$ 150.0
Optional additional borrowing capacity	$ 75.0
Current borrowing capacity, percent of eligible billed accounts receivable	85.00%
Current borrowing capacity, percent of eligible unbilled accounts receivable less certain reserves	80.00%
October 2015 Line of Credit [Member] | Revolving Credit Facility [Member] | UNITED STATES
Subsequent Event [Line Items]
Current borrowing capacity	$ 122.5
October 2015 Line of Credit [Member] | Revolving Credit Facility [Member] | CANADA
Subsequent Event [Line Items]
Current borrowing capacity	15.0
October 2015 Line of Credit [Member] | Revolving Credit Facility [Member] | UNITED KINGDOM
Subsequent Event [Line Items]
Current borrowing capacity	12.5
October 2015 Line of Credit [Member] | Swingline Loans [Member]
Subsequent Event [Line Items]
Current borrowing capacity	30.0
October 2015 Line of Credit [Member] | Letter of Credit [Member]
Subsequent Event [Line Items]
Current borrowing capacity	$ 20.0
EdgeRock Technologies, LLC [Member]
Subsequent Event [Line Items]
Payments to acquire businesses		$ 31.3
Contingent consideration arrangements, range of outcomes, high		$ 4.0