Variable Interest Entities - Schedule of Consolidated VIEs Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 97,649	$ 133,813
Accounts receivable, net	322,439	281,332
Other current assets	86,037	79,886
Total current assets	506,125	495,031
Property and equipment, net	1,952,045	1,771,159
Goodwill	2,222,805	2,199,937	$ 2,105,264
Intangible assets, net	76,041	70,145
Operating lease right-of-use assets	135,238	133,761
Total assets	4,987,901	4,768,078
Accounts payable	104,723	98,575
Accrued salaries and benefits	125,298	137,845
Current portion of operating lease liabilities	26,463	23,348
Other accrued liabilities	110,592	126,499
Total current liabilities	388,326	404,861
Operating lease liabilities	116,429	116,841
Other liabilities	125,033	110,505
Total liabilities	2,086,917	2,185,201
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents	32,478	26,360
Accounts receivable, net	23,789	20,144
Other current assets	2,561	1,304
Total current assets	58,828	47,808
Property and equipment, net	313,358	220,793
Goodwill	39,564	34,945
Intangible assets, net	16,139	10,490
Operating lease right-of-use assets	6,284	6,603
Total assets	434,173	320,639
Accounts payable	4,650	3,690
Accrued salaries and benefits	6,866	5,656
Current portion of operating lease liabilities	233	197
Other accrued liabilities	6,179	6,818
Total current liabilities	17,928	16,361
Operating lease liabilities	6,433	6,666
Other liabilities		1,083
Total liabilities	$ 24,361	$ 24,110