Quarterly Financial Information (Unaudited) (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended					12 Months Ended
	Nov. 10, 2016	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Line Items]
Deferred debt issuance cost written off with existing Credit Facility							$ 0	$ 5,224	$ 1,433
Netsmart First Lien Credit Agreement [Member]
Quarterly Financial Information Disclosure [Line Items]
Deferred debt issuance cost written off with existing Credit Facility	$ 5,200
Income Tax Benefit (Provision) [Member]
Quarterly Financial Information Disclosure [Line Items]
Tax Credit Carryforward, Valuation Allowance		$ (14,300)	$ (3,300)	$ 900	$ (900)
Interest Expense [Member] | Netsmart First Lien Credit Agreement [Member]
Quarterly Financial Information Disclosure [Line Items]
Deferred debt issuance cost written off with existing Credit Facility		$ 5,200
Interest Expense [Member] | Senior Secured Credit Facility [Member]
Quarterly Financial Information Disclosure [Line Items]
Deferred debt issuance cost written off with existing Credit Facility						$ 1,400