OUTSOURCED GOVERNMENT CONTRACTS - Summary of Enterprise-Wide Outsourced Portal and Digital Government Services to Multiple Governments Agencies (Details)	12 Months Ended
	Dec. 31, 2017
NICUSA, IL Division
Contracts [Line Items]
Portal Website (State)	Illinois
Year Services Commenced	2017
Contract Expiration Date (Renewal Options Through)	Jun. 29, 2023
Louisiana Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Louisiana
Year Services Commenced	2015
Contract Expiration Date (Renewal Options Through)	Jan. 28, 2020
Connecticut Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Connecticut
Year Services Commenced	2014
Contract Expiration Date (Renewal Options Through)	Jan. 09, 2020
Wisconsin Interactive Network, LLC
Contracts [Line Items]
Portal Website (State)	Wisconsin
Year Services Commenced	2013
Contract Expiration Date (Renewal Options Through)	May 13, 2018
Pennsylvania Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Pennsylvania
Year Services Commenced	2012
Contract Expiration Date (Renewal Options Through)	Nov. 30, 2019
NICUSA, OR Division
Contracts [Line Items]
Portal Website (State)	Oregon
Year Services Commenced	2011
Contract Expiration Date (Renewal Options Through)	Nov. 22, 2021
NICUSA, MD Division
Contracts [Line Items]
Portal Website (State)	Maryland
Year Services Commenced	2011
Contract Expiration Date (Renewal Options Through)	Aug. 11, 2019
Mississippi Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Mississippi
Year Services Commenced	2011
Contract Expiration Date (Renewal Options Through)	Dec. 31, 2019
New Jersey Interactive, LLC
Contracts [Line Items]
Portal Website (State)	New Jersey
Year Services Commenced	2009
Contract Expiration Date (Renewal Options Through)	May 01, 2020
Texas NICUSA, LLC
Contracts [Line Items]
Portal Website (State)	Texas
Year Services Commenced	2009
Contract Expiration Date (Renewal Options Through)	Aug. 31, 2018
West Virginia Interactive, LLC
Contracts [Line Items]
Portal Website (State)	West Virginia
Year Services Commenced	2007
Contract Expiration Date (Renewal Options Through)	Jun. 30, 2021
Vermont Information Consortium, LLC
Contracts [Line Items]
Portal Website (State)	Vermont
Year Services Commenced	2006
Contract Expiration Date (Renewal Options Through)	Jun. 08, 2019
Colorado Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Colorado
Year Services Commenced	2005
Contract Expiration Date (Renewal Options Through)	Apr. 30, 2019
South Carolina Interactive, LLC
Contracts [Line Items]
Portal Website (State)	South Carolina
Year Services Commenced	2005
Contract Expiration Date (Renewal Options Through)	Jul. 15, 2019
Kentucky Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Kentucky
Year Services Commenced	2003
Contract Expiration Date (Renewal Options Through)	Aug. 31, 2018
Alabama Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Alabama
Year Services Commenced	2002
Contract Expiration Date (Renewal Options Through)	Mar. 19, 2020
Rhode Island Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Rhode Island
Year Services Commenced	2001
Contract Expiration Date (Renewal Options Through)	Jul. 01, 2018
Oklahoma Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Oklahoma
Year Services Commenced	2001
Contract Expiration Date (Renewal Options Through)	Mar. 31, 2018
Montana Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Montana
Year Services Commenced	2001
Contract Expiration Date (Renewal Options Through)	Dec. 31, 2019
Hawaii Information Consortium, LLC
Contracts [Line Items]
Portal Website (State)	Hawaii
Year Services Commenced	2000
Contract Expiration Date (Renewal Options Through)	Jan. 03, 2019
Idaho Information Consortium, LLC
Contracts [Line Items]
Portal Website (State)	Idaho
Year Services Commenced	2000
Contract Expiration Date (Renewal Options Through)	Jun. 30, 2018
Utah Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Utah
Year Services Commenced	1999
Contract Expiration Date (Renewal Options Through)	Jun. 05, 2019
Maine Information Network, LLC
Contracts [Line Items]
Portal Website (State)	Maine
Year Services Commenced	1999
Contract Expiration Date (Renewal Options Through)	Jul. 01, 2018
Arkansas Information Consortium, LLC
Contracts [Line Items]
Portal Website (State)	Arkansas
Year Services Commenced	1997
Contract Expiration Date (Renewal Options Through)	Jun. 30, 2018
Indiana Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Indiana
Year Services Commenced	1995
Contract Expiration Date (Renewal Options Through)	Oct. 24, 2021
Nebraska Interactive, LLC
Contracts [Line Items]
Portal Website (State)	Nebraska
Year Services Commenced	1995
Contract Expiration Date (Renewal Options Through)	Apr. 01, 2019
Kansas Information Consortium, LLC
Contracts [Line Items]
Portal Website (State)	Kansas
Year Services Commenced	1992
Contract Expiration Date (Renewal Options Through)	Dec. 31, 2022
Renewal Options | NICUSA, IL Division
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	Jun. 29, 2027
Renewal Options | Wisconsin Interactive Network, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	May 13, 2023
Renewal Options | Pennsylvania Interactive, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	Nov. 30, 2022
Renewal Options | NICUSA, MD Division
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)
Renewal Options | Mississippi Interactive, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	Dec. 31, 2021
Renewal Options | New Jersey Interactive, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	May 01, 2022
Renewal Options | West Virginia Interactive, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	Jun. 30, 2024
Renewal Options | Colorado Interactive, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	Apr. 30, 2023
Renewal Options | South Carolina Interactive, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	Jul. 15, 2021
Renewal Options | Alabama Interactive, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	Mar. 19, 2022
Renewal Options | Rhode Island Interactive, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	Jul. 01, 2019
Renewal Options | Oklahoma Interactive, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	Mar. 31, 2020
Renewal Options | Montana Interactive, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	Dec. 31, 2020
Renewal Options | Hawaii Information Consortium, LLC
Contracts [Line Items]
Renewal Term	P3Y
Renewal Options | Indiana Interactive, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	Oct. 24, 2025
Renewal Options | Nebraska Interactive, LLC
Contracts [Line Items]
Contract Expiration Date (Renewal Options Through)	Apr. 01, 2021
Renewal Options | Kansas Information Consortium, LLC
Contracts [Line Items]
Renewal Term	P1Y