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Employee Benefit Plans - Schedule of Weighted-Average Asset Allocation by Asset Category in Partnerships in Care Pension Plan (Detail) - Pension Plan [Member] - Partnership in Care Benefits Plan [Member]	Dec. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation	1.40%	1.30%
Foreign Government Debt Securities [Member] | United Kingdom [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation	16.20%	15.00%
Annuity Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation	35.10%	38.60%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation	28.80%	25.40%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation	12.50%	15.80%
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation	6.00%	3.90%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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