Schedule of Consideration Funded by Sources of Funds (Detail) - USD ($) $ in Thousands			12 Months Ended
	Oct. 27, 2016	Apr. 19, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Cash contribution for redeemable convertible non-controlling interest			$ 0	$ 333,605	$ 0
Netsmart Inc Management [Member]
Business Acquisition [Line Items]
Exchange of Netsmart common stock for redeemable convertible non-controlling interest			$ 0	$ 25,543	$ 0
Netsmart [Member]
Business Acquisition [Line Items]
Net borrowings under new term loans		$ 534,135
Total consideration for NantHealth provider/patient solutions business		937,066
Netsmart [Member] | GI Partners [Member]
Business Acquisition [Line Items]
Cash contribution for redeemable convertible non-controlling interest		333,606
Netsmart [Member] | Netsmart Inc Management [Member]
Business Acquisition [Line Items]
Exchange of Netsmart common stock for redeemable convertible non-controlling interest		25,543
Netsmart [Member] | Allscripts [Member]
Business Acquisition [Line Items]
Cash contribution from borrowings under revolver in exchange for common stock		$ 43,782
HealthMEDX, LLC [Member]
Business Acquisition [Line Items]
Net borrowings under new term loans	$ 36,195
Contingent consideration payable to former HealthMEDX owners	2,888
Deferred cash consideration	100
Total consideration for NantHealth provider/patient solutions business	$ 39,183