Preferred Stock and Units - Schedule of Series of Cumulative Redeemable Perpetual Preferred Stock (Parenthetical) (Detail) $ in Millions	9 Months Ended
Sep. 30, 2020 USD ($)
Class Of Stock Disclosures [Abstract]
Preferred stock amount of undeclared and cumulative preferred dividends	$ 4.4

Preferred stock amount of undeclared cumulative preferred dividends.

No definition available.

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Namespace Prefix:	soho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration