Interest Expense (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Write-off of unamortized deferred debt issuance costs										$ 5,224	$ 1,433	$ 0
Interest expense		$ 25,384	$ 19,367	$ 16,421	$ 6,969	$ 7,403	$ 9,254	$ 7,483	$ 7,256	68,141	31,396	29,297
Total interest expense										68,141	31,396	29,297
Convertible Senior Notes and Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Interest expense										15,556	16,284	16,020
Amortization of discounts and debt issuance costs										13,922	13,679	13,277
Write-off of unamortized deferred debt issuance costs										0	1,433	0
Netsmart [Member]
Debt Instrument [Line Items]
Amortization of discounts and debt issuance costs										2,619	0	0
Write-off of unamortized deferred debt issuance costs										5,224	0	0
Interest expense	[1]									$ 30,820	$ 0	$ 0

[1] Includes interest expense related to capital leases.