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Revenue - Schedule of Revenue and Percentage Generated by Each Payor Type in U.S Facilities (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Health Care Organization, Receivable and Revenue Disclosures [Line Items]                      
Revenue $ 541,276 $ 547,961 $ 491,475 $ 509,217 $ 501,225 $ 509,383 $ 509,813 $ 487,960 $ 2,089,929 $ 2,008,381 $ 1,904,695
U.S. Facilities [Member]                      
Health Care Organization, Receivable and Revenue Disclosures [Line Items]                      
Revenue                 $ 2,089,929 $ 2,008,381 $ 1,904,695
Revenue, Percentage                 100.00% 100.00% 100.00%
U.S. Facilities [Member] | Commercial [Member]                      
Health Care Organization, Receivable and Revenue Disclosures [Line Items]                      
Revenue                 $ 596,698 $ 565,350 $ 573,089
Revenue, Percentage                 28.50% 28.20% 30.10%
U.S. Facilities [Member] | Medicare [Member]                      
Health Care Organization, Receivable and Revenue Disclosures [Line Items]                      
Revenue                 $ 330,070 $ 294,691 $ 280,340
Revenue, Percentage                 15.80% 14.70% 14.70%
U.S. Facilities [Member] | Medicaid [Member]                      
Health Care Organization, Receivable and Revenue Disclosures [Line Items]                      
Revenue                 $ 1,037,852 $ 1,007,102 $ 893,644
Revenue, Percentage                 49.70% 50.10% 46.90%
U.S. Facilities [Member] | Self-Pay [Member]                      
Health Care Organization, Receivable and Revenue Disclosures [Line Items]                      
Revenue                 $ 98,302 $ 118,716 $ 134,054
Revenue, Percentage                 4.70% 5.90% 7.10%
U.S. Facilities [Member] | Other [Member]                      
Health Care Organization, Receivable and Revenue Disclosures [Line Items]                      
Revenue                 $ 27,007 $ 22,522 $ 23,568
Revenue, Percentage                 1.30% 1.10% 1.20%