Debt Outstanding Excluding Capital Lease Obligations (Detail) - USD ($) $ in Thousands	Dec. 31, 2017		Dec. 31, 2016
Debt Instrument [Line Items]
Principal Balance	$ 1,620,066		$ 1,386,813
Unamortized Discount and Debt Issuance Costs	57,706		74,433
Net Carrying Amount	1,562,360		1,312,380
Principal Balance, Current	28,125		15,638
Unamortized Discount and Debt Issuance Costs, Current	438		480
Net Carrying Amount, Current	27,687		15,158
Principal Balance, Noncurrent	1,587,075		1,366,824
Unamortized Discount and Debt Issuance Costs, Noncurrent	55,157		72,053
Net Carrying Amount, Noncurrent	1,531,918		1,294,771
Netsmart [Member]
Debt Instrument [Line Items]
Principal Balance, Current	4,866		4,351
Unamortized Discount and Debt Issuance Costs, Current	2,111		1,900
Net Carrying Amount, Current	2,755		2,451
1.25% Cash Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Principal Balance	345,000	[1]	345,000
Unamortized Discount and Debt Issuance Costs	35,978		49,186
Net Carrying Amount	309,022		295,814
Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Principal Balance	628,750		441,875
Unamortized Discount and Debt Issuance Costs	3,360		4,691
Net Carrying Amount	625,390		437,184
Netsmart Non-Recourse Debt First Lien Term Loan [Member]
Debt Instrument [Line Items]
Principal Balance	479,316		432,925
Unamortized Discount and Debt Issuance Costs	10,950		11,655
Net Carrying Amount	468,366		421,270
Netsmart Non-Recourse Debt Second Lien Term Loan [Member]
Debt Instrument [Line Items]
Principal Balance	167,000		167,000
Unamortized Discount and Debt Issuance Costs	7,418		8,901
Net Carrying Amount	159,582		158,099
Other Debt [Member]
Debt Instrument [Line Items]
Principal Balance	0		13
Unamortized Discount and Debt Issuance Costs	0		0
Net Carrying Amount	$ 0		$ 13

[1] Assumes no cash conversions of the 1.25% Notes prior to their maturity on July 1, 2020.