Summary of Significant Accounting Policies and Basis of Presentation - Intangible Assets (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Research and development costs		$ 3,100,000	$ 6,000,000	$ 4,000,000
Software developed for internal use [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Software development costs, estimated useful life		3 years
Software developed for internal use [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Software development costs, estimated useful life		7 years
Software development, intended for sale [Member]
Finite-Lived Intangible Assets [Line Items]
Software development costs, estimated useful life		3 years
Software development, intended for sale and internal use [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment charges	4,200,000	0	4,200,000	0
Software development, intended for sale and internal use [Member] | Recovery Audit Services - Americas [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment charges			2,700,000
Software development, intended for sale and internal use [Member] | Healthcare Claims Recovery Audit Services [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment charges			1,400,000
Software development, intended for sale and internal use [Member] | Adjacent Services Segment [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment charges			$ 100,000