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Results of Operations of Nonconsolidated Affiliates - Additional Information (Detail) (USD $)
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0 Months Ended |
12 Months Ended |
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Oct. 02, 2014
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Dec. 31, 2014
Transactions
Entity
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Dec. 31, 2013
Transactions
Facility
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Dec. 31, 2012
Transactions
Facility
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| Schedule Of Equity Method Investments [Line Items] |
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| Number of investments in nonconsolidated affiliates |
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65 |
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| Number of deconsolidation transactions |
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2 |
2 |
1 |
| Cash proceeds from deconsolidation |
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$ 2,400,000 |
$ 2,100,000 |
$ 4,300,000 |
| Pre-tax gain or loss from revaluation of investment |
2,700,000 |
3,400,000 |
|
2,000,000 |
| (Gain) loss on sale of investments |
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(7,633,000) |
12,330,000 |
7,100,000 |
| Pre-tax loss from revaluation of investment |
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(32,564,000) |
(23,364,000) |
(16,767,000) |
| Investment in affiliates |
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|
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1,600,000 |
| Number of consolidated facilities contributed to joint venture |
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|
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2 |
| Loss on sale of investment |
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|
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3,300,000 |
| Impairment of investments in nonconsolidated affiliates |
|
300,000 |
6,100,000 |
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| Difference between carrying amount on investment and underlying equity |
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67,700,000 |
76,900,000 |
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| Amortization expense of definite-lived intangible assets attributable to equity method investments |
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23,200,000 |
25,900,000 |
20,300,000 |
| Wausau Surgery Center, L. P. [Member] |
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| Schedule Of Equity Method Investments [Line Items] |
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|
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| Impairment of investments in nonconsolidated affiliates |
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|
1,500,000 |
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| Premier Surgery Center of Louisville, L.P. [Member] |
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| Schedule Of Equity Method Investments [Line Items] |
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| Impairment of investments in nonconsolidated affiliates |
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2,300,000 |
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| Kerlan-Jobe Surgery Center, LLC [Member] |
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|
|
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| Schedule Of Equity Method Investments [Line Items] |
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|
|
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| Impairment of investments in nonconsolidated affiliates |
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|
900,000 |
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| Surgery Center of Fort Collins, LLC [Member] |
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|
|
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| Schedule Of Equity Method Investments [Line Items] |
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|
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| Impairment of investments in nonconsolidated affiliates |
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|
800,000 |
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| Surgery Center of Lexington, LLC [Member] |
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| Schedule Of Equity Method Investments [Line Items] |
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| Impairment of investments in nonconsolidated affiliates |
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600,000 |
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| Deconsolidation Transaction One [Member] |
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|
|
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| Schedule Of Equity Method Investments [Line Items] |
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|
|
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| (Gain) loss on sale of investments |
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1,600,000 |
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| Deconsolidation Transaction Two [Member] |
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|
|
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| Schedule Of Equity Method Investments [Line Items] |
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|
|
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| Pre-tax loss from revaluation of investment |
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1,500,000 |
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| Nonconsolidated [Member] |
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| Schedule Of Equity Method Investments [Line Items] |
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| (Gain) loss on sale of investments |
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$ 22,000 |
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| Number of investments in nonconsolidated affiliates impaired |
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1 |
5 |
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| Minimum [Member] |
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| Schedule Of Equity Method Investments [Line Items] |
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|
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| Ownership percentage |
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5.00% |
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| Maximum [Member] |
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| Schedule Of Equity Method Investments [Line Items] |
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| Ownership percentage |
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50.00% |
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