Sale of Properties (Details) - Renaissance Plaza '93, L.P. - Affiliate Of General Partner - USD ($)	3 Months Ended
Jun. 30, 2017	May 15, 2017
Schedule Of Sale Of Properties [Line Items]
Sale price of limited partnership interest		$ 35,000
Gain on sale of limited partnership interest	$ 15,255,000

Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

No definition available.

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