Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands					3 Months Ended	9 Months Ended
	Aug. 25, 2017	Jul. 17, 2017	Oct. 27, 2016	Apr. 19, 2016	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Cash paid for business acquisitions						$ 54,308	$ 935,280
Goodwill						$ 1,971,950		$ 1,924,052
Contribution and investment agreement date						Mar. 20, 2016
Increase in goodwill from subsequent adjustment of liability						$ 9,058
Homecare Business [Member]
Business Acquisition [Line Items]
Escrow deposit related to the integration of homecare business				$ 15,000		11,300
Escrow deposit period				5 years
Asset Purchase Agreement [Member]
Business Acquisition [Line Items]
Goodwill					$ 4,400
Asset purchase agreement date					Mar. 31, 2017
Aggregate cash consideration to acquire intellectual property, certain contractual relationships and certain associates					$ 4,000
Business combination, estimated consideration payable					700
Contingent consideration, fair value						500
NantHealth, Inc. [Member]
Business Acquisition [Line Items]
Goodwill	$ 9,058
Acquired cash and cash equivalents, and restricted cash	21
Liabilities assumed, deferred revenue	$ 9,300
Number of shares as consideration for asset purchase agreement	15,000,000
Aggregate consideration with a fair value	$ 42,750
Business combination, aggregate consideration	$ 21,792
NantHealth, Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets						$ 9,200
Intangible assets, useful life (in years)						19 years
Netsmart [Member]
Business Acquisition [Line Items]
Netsmart transaction completion date						Apr. 19, 2016
HealthMEDX, LLC [Member]
Business Acquisition [Line Items]
Date of acquisition			Oct. 27, 2016
Business combination, aggregate consideration			$ 39,200
Business combination, adjustment of fair value of liability					100
Increase in goodwill from subsequent adjustment of liability					$ 100
Netsmart [Member]
Business Acquisition [Line Items]
Goodwill						$ 712,786		$ 675,340
Increase in goodwill from subsequent adjustment of liability						$ 0
Netsmart [Member] | DeVero, Inc. [Member]
Business Acquisition [Line Items]
Cash paid for business acquisitions		$ 50,700
Goodwill		32,900
Acquired cash and cash equivalents, and restricted cash		2,000
Assets acquired, other operating assets		1,500
Liabilities assumed, accounts payable and accrued expenses		2,300
Liabilities assumed, deferred revenue		900
Liabilities assumed, deferred tax liabilities net		8,400
Date of acquisition						Jul. 17, 2017
Goodwill, expected tax deductible amount		0
Netsmart [Member] | DeVero, Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets		19,000
Intangible assets, useful life (in years)						7 years
Netsmart [Member] | DeVero, Inc. [Member] | Technology [Member]
Business Acquisition [Line Items]
Intangible assets		$ 6,900
Intangible assets, useful life (in years)						20 years