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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% |  |  |

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