Revenue - Schedule of U.K. Revenue Attributed to Each Category (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 782,810	$ 760,617
U.K. Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	273,593	272,657
U.K. Facilities [Member] \| Health Care Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	148,137	151,708
U.K. Facilities [Member] \| Education and Children's Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	46,666	46,122
U.K. Facilities [Member] \| Adult Care Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 78,790	$ 74,827

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration