Business Combinations and Other Investments - Formation of Joint Business Entity and Acquisition of Netsmart, Inc. - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Apr. 19, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 02, 2016	Oct. 14, 2016
Business Acquisition [Line Items]
Contribution and investment agreement date			Mar. 20, 2016
Description of liquidation preference			The liquidation preference is equal to the greater of (i) a return of the original issue price plus a preferred return (accruing on a daily basis at the rate of 11% per annum and compounding annually on the last day of each calendar year) or (ii) the as-converted value of Class A Common Units in Nathan.
Preferred return percentage			11.00%
Equity ownership percentage	49.10%			100.00%	100.00%
Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Acquisition-related costs			$ 4,100
GI Partners [Member]
Business Acquisition [Line Items]
Minority interest percentage	47.20%
Netsmart Management [Member]
Business Acquisition [Line Items]
Minority interest percentage	3.70%
Netsmart [Member]
Business Acquisition [Line Items]
Netsmart transaction completion date			Apr. 19, 2016
Business combination, purchase price	$ 950,000
Equity ownership percentage	49.10%
Business combination, aggregate consideration	$ 937,066
Extinguishment of debt	325,000
Accrued interest and fees	2,000
Decrease in accounts receivable, net acquired		$ 3,600
Increase in prepaid expenses and other assets, acquired		300
Decrease in other assets, acquired		300
Increase in deferred taxes, net acquired		700
Decrease in other liabilities		600
Increase in the residual allocation to goodwill		$ 3,700
Netsmart [Member] | Nathan [Member]
Business Acquisition [Line Items]
Business combination, aggregate consideration	937,000
Netsmart [Member] | Homecare Business [Member]
Business Acquisition [Line Items]
Escrow deposit related to the integration of homecare business	$ 15,000
Escrow deposit period	5 years