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Revenue - Schedule of U.K. Revenue and Percentage Generated by Each Payor Type (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Health Care Organization, Receivable and Revenue Disclosures [Line Items] |  |
Revenue | $ 760,617 | $ 742,241
U.K. Facilities [Member] |  |
Health Care Organization, Receivable and Revenue Disclosures [Line Items] |  |
Revenue | $ 272,657 | $ 279,836
Revenue, Percentage | 100.00% | 100.00%
U.K. Facilities [Member] | U.K. Public Funded Sources [Member] |  |
Health Care Organization, Receivable and Revenue Disclosures [Line Items] |  |
Revenue | $ 245,413 | $ 253,294
Revenue, Percentage | 90.00% | 90.50%
U.K. Facilities [Member] | Self-Pay [Member] |  |
Health Care Organization, Receivable and Revenue Disclosures [Line Items] |  |
Revenue | $ 26,814 | $ 25,068
Revenue, Percentage | 9.80% | 9.00%
U.K. Facilities [Member] | Other [Member] |  |
Health Care Organization, Receivable and Revenue Disclosures [Line Items] |  |
Revenue | $ 430 | $ 1,474
Revenue, Percentage | 0.20% | 0.50%

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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