Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill	$ 1,189,585	$ 1,200,746	$ 1,189,585
Additions arising from business acquisitions		22,319	12,173
Foreign exchange translation		(464)	(1,012)
Goodwill, net		1,222,601	1,200,746
Oasis Medical Solutions Limited [Member]
Goodwill [Line Items]
Additions arising from business acquisitions			11,155
dbMotion [Member]
Goodwill [Line Items]
Additions arising from business acquisitions	1,000		1,018
Goodwill, net		137,649
Clinical and Financial Solutions [Member]
Goodwill [Line Items]
Goodwill	764,369	774,512	764,369
Additions arising from business acquisitions		22,319	11,155
Foreign exchange translation		(464)	(1,012)
Goodwill, net		796,367	774,512
Clinical and Financial Solutions [Member] | Oasis Medical Solutions Limited [Member]
Goodwill [Line Items]
Additions arising from business acquisitions			11,155
Population Health [Member]
Goodwill [Line Items]
Goodwill	$ 425,216	426,234	425,216
Additions arising from business acquisitions		0	1,018
Foreign exchange translation		0	0
Goodwill, net		$ 426,234	426,234
Population Health [Member] | Oasis Medical Solutions Limited [Member]
Goodwill [Line Items]
Additions arising from business acquisitions			0
Population Health [Member] | dbMotion [Member]
Goodwill [Line Items]
Additions arising from business acquisitions			$ 1,018