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Purchase of Ownership Interest from Joint Venture - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) Location
Business Acquisition [Line Items]
Cash consideration paid to obtain additional ownership	$ 32,400
Homans Associates II LLC [Member]
Business Acquisition [Line Items]
Additional ownership interest acquired	20.00%
Percentage of ownership interest	100.00%
Cash consideration paid to obtain additional ownership	$ 32,400
Number of locations in which the company operates | Location	16

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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.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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The cash outflow associated with the purchase of noncontrolling interest during the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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Additional ownership interest acquired.

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No Of Locations From where this enterprise carries out its operations.

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