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Goodwill - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]            
Goodwill impaired facts and circumstances leading to impairment description     Based on continuing developments at the Company’s HCP reporting units during the second quarter of 2016, including the Medicare Advantage final benchmark rates for 2017 announced on April 4, 2016, further changes in expectations concerning future government reimbursement rates and the Company’s expected ability to mitigate them, as well as medical cost and utilization trends, underperformance of certain at-risk units in recent quarters and other market conditions, the Company performed additional impairment assessments for certain at-risk HCP reporting units during the quarter ended June 30, 2016.      
Goodwill impairment charges $ 176,000 $ 4,065 $ 253,000 $ 4,065 $ 192,834  
Goodwill 9,360,957   $ 9,360,957   9,294,479 $ 9,415,295
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 2.2% 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 4.8% and 4.5%, respectively.      
HealthCare Partners (HCP)            
Goodwill [Line Items]            
Goodwill impairment charges     $ 253,000   188,769  
Goodwill 3,393,128   $ 3,393,128   $ 3,398,264 $ 3,562,534
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 impairment charges 79,000          
Goodwill $ 262,668   $ 262,668      
Percentage of fair value in excess of (short of) carrying amount (25.60%)   (25.60%)      
HealthCare Partners (HCP) | Nevada | Long-term Reduction of 3% Percent Operating Income            
Goodwill [Line Items]            
Percentage of Fair value in excess of carrying amount 2.20%   2.20%      
HealthCare Partners (HCP) | Nevada | Increase In Discount Rates By 100 Basis Points            
Goodwill [Line Items]            
Percentage of Fair value in excess of carrying amount 4.80%   4.80%      
HealthCare Partners (HCP) | Florida            
Goodwill [Line Items]            
Goodwill impairment charges $ 97,000          
Goodwill $ 442,835   $ 442,835      
Percentage of fair value in excess of (short of) carrying amount (15.00%)   (15.00%)      
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%   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 4.50%   4.50%      
HealthCare Partners (HCP) | Colorado            
Goodwill [Line Items]            
Goodwill $ 16,897   $ 16,897      
Percentage of fair value in excess of (short of) carrying amount 13.00%   13.00%      
Kidney Care | Malaysia            
Goodwill [Line Items]            
Goodwill $ 13,668   $ 13,668      
Percentage of fair value in excess of (short of) carrying amount 10.20%   10.20%