Assets Held for Sale - Additional Information (Details)	Jun. 30, 2019 a
Plano, Texas
Long Lived Assets Held For Sale [Line Items]
Land held for sale	16

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.

No definition available.

Name:	us-gaap_LongLivedAssetsHeldForSaleLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration