Goodwill - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, impaired, facts and circumstances leading to impairment, description	During the quarter ended December 31, 2015, and in conjunction with the annual goodwill impairment assessment for its HCP reporting units as of November 1, the Company determined that circumstances indicated it had become more likely than not that the goodwill and an indefinite-lived intangible asset of certain HCP reporting units had become impaired. These circumstances included underperformance of the business in recent quarters as well as changes in other market conditions, including government reimbursement cuts and our expected ability to mitigate them. We are performing the required “step 1” and “step 2” valuations for these HCP reporting units and have estimated the fair value of their net assets and implied goodwill with the assistance of a third-party valuation firm. The Company also recorded a minor goodwill impairment charge on one of its international operations during 2015.
Goodwill	$ 9,294,479,000	$ 9,415,295,000	$ 9,212,974,000
Goodwill impairment charge description	For example, a sustained, long-term reduction of 3% in operating income for HCP Nevada or HCP Florida could reduce their estimated fair values by up to 2.0% and 1.6%, respectively. Separately, an increase in their respective discount rates of 100 basis points could reduce the estimated fair values of HCP Nevada and HCP Florida by up to 2.9% and 2.8%, respectively.
Pre-tax goodwill impairment charge	$ 192,834,000
HealthCare Partners (HCP)
Goodwill [Line Items]
Goodwill	3,398,264,000	3,562,534,000	$ 3,516,162,000
Pre-tax goodwill impairment charge	$ 188,769,000
HealthCare Partners (HCP) | Long-term Reduction of 3% Percent Operating Income
Goodwill [Line Items]
Decrease in operating income percentage used for assessment of fair values	3.00%
HealthCare Partners (HCP) | Increase In Discount Rates By 100 Basis Points
Goodwill [Line Items]
Increase in discount rates used for assessment of fair values	1.00%
HealthCare Partners (HCP) | Nevada
Goodwill [Line Items]
Goodwill	$ 424,468,000
Percentage of fair value in excess of (short of) carrying amount	(3.40%)
Pre-tax goodwill impairment charge	$ 181,253,000
HealthCare Partners (HCP) | Nevada | Long-term Reduction of 3% Percent Operating Income
Goodwill [Line Items]
Percentage of Fair value in excess of carrying amount	(2.00%)
HealthCare Partners (HCP) | Nevada | Increase In Discount Rates By 100 Basis Points
Goodwill [Line Items]
Percentage of Fair value in excess of carrying amount	(2.90%)
HealthCare Partners (HCP) | Florida
Goodwill [Line Items]
Goodwill	$ 530,075,000
Percentage of fair value in excess of (short of) carrying amount	0.70%
Pre-tax goodwill impairment charge	$ 5,800,000
HealthCare Partners (HCP) | Florida | Long-term Reduction of 3% Percent Operating Income
Goodwill [Line Items]
Percentage of Fair value in excess of carrying amount	(1.60%)
HealthCare Partners (HCP) | Florida | Increase In Discount Rates By 100 Basis Points
Goodwill [Line Items]
Percentage of Fair value in excess of carrying amount	(2.80%)
HealthCare Partners (HCP) | Colorado
Goodwill [Line Items]
Goodwill	$ 16,897,000
Percentage of fair value in excess of (short of) carrying amount	9.50%
Kidney Care | Malaysia
Goodwill [Line Items]
Goodwill	$ 13,329,000
Percentage of fair value in excess of (short of) carrying amount	11.20%
Reporting Units Other Than Healthcare Partners
Goodwill [Line Items]
Pre-tax goodwill impairment charge	$ 0	$ 0