Investments in Real Estate (Detail) - Schedule of Real Estate Properties	9 Months Ended
	Sep. 30, 2020 USD ($) a ft²
MVP Cleveland West 9th [Member]
Location	Cleveland, OH
Date Acquired	5/11/2016
Property Type	Lot
# Spaces	260
Property Size (Acres) | a	2
Investment Amount	$ 5,845,000
Parking Tenant	SP +
33740 Crown Colony [Member]
Location	Cleveland, OH
Date Acquired	5/17/2016
Property Type	Lot
# Spaces	82
Property Size (Acres) | a	0.54
Investment Amount	$ 2,954,000
Parking Tenant	SP +
MCI 1372 Street [Member]
Location	Canton, OH
Date Acquired	7/8/2016
Property Type	Lot
# Spaces	66
Property Size (Acres) | a	0.44
Investment Amount	$ 700,000
Parking Tenant	ABM
MVP Cincinnati Race Street Garage [Member]
Location	Cincinnati, OH
Date Acquired	7/8/2016
Property Type	Garage
# Spaces	350
Property Size (Acres) | a	0.63
Investment Amount	$ 5,848,000
Parking Tenant	SP +
MVP St. Louis Washington [Member]
Location	St Louis, MO
Date Acquired	7/18/2016
Property Type	Lot
# Spaces	63
Property Size (Acres) | a	0.39
Investment Amount	$ 1,637,000
Parking Tenant	SP +
MVP St. Paul Holiday Garage [Member]
Location	St Paul, MN
Date Acquired	8/12/2016
Property Type	Garage
# Spaces	285
Property Size (Acres) | a	0.85
Investment Amount	$ 8,396,000
Parking Tenant	Interstate Parking
MVP Louisville Station Broadway [Member]
Location	Louisville, KY
Date Acquired	8/23/2016
Property Type	Lot
# Spaces	165
Property Size (Acres) | a	1.25
Investment Amount	$ 3,007,000
Parking Tenant	Riverside Parking
White Front Garage Partners [Member]
Location	Nashville, TN
Date Acquired	9/30/2016
Property Type	Garage
# Spaces	155
Property Size (Acres) | a	0.26
Investment Amount	$ 11,672,000
Parking Tenant	Premier Parking
Cleveland Lincoln Garage Owners [Member]
Location	Cleveland, OH
Date Acquired	10/19/2016
Property Type	Garage
# Spaces	536
Property Size (Acres) | a	1.14
Retail Sq. Ft | ft²	45,272
Investment Amount	$ 8,272,000
Parking Tenant	SP +
MVP Houston Preston Lot [Member]
Location	Houston, TX
Date Acquired	11/22/2016
Property Type	Lot
# Spaces	46
Property Size (Acres) | a	0.23
Investment Amount	$ 2,820,000
Parking Tenant	Premier Parking
MVP Houston San Jacinto Lot [Member]
Location	Houston, TX
Date Acquired	11/22/2016
Property Type	Lot
# Spaces	85
Property Size (Acres) | a	0.65
Retail Sq. Ft | ft²	240
Investment Amount	$ 3,250,000
Parking Tenant	Premier Parking
MVP Detroit Center Garage [Member]
Location	Detroit, MI
Date Acquired	2/1/2017
Property Type	Garage
# Spaces	1,275
Property Size (Acres) | a	1.28
Investment Amount	$ 55,477,000
Parking Tenant	SP +
St. Louis Broadway [Member]
Location	St Louis, MO
Date Acquired	5/6/2017
Property Type	Lot
# Spaces	161
Property Size (Acres) | a	0.96
Investment Amount	$ 2,400,000
Parking Tenant	St. Louis Parking
St. Louis Seventh & Cerre [Member]
Location	St Louis, MO
Date Acquired	5/6/2017
Property Type	Lot
# Spaces	174
Property Size (Acres) | a	1.06
Investment Amount	$ 3,300,000
Parking Tenant	St. Louis Parking
MVP Preferred Parking [Member]
Location	Houston, TX
Date Acquired	8/1/2017
Property Type	Garage/Lot
# Spaces	528
Property Size (Acres) | a	0.98
Retail Sq. Ft | ft²	784
Investment Amount	$ 20,479,000
Parking Tenant	Premier Parking
MVP Raider Park Garage [Member]
Location	Lubbock, TX
Date Acquired	11/21/2017
Property Type	Garage
# Spaces	1,495
Property Size (Acres) | a	2.15
Retail Sq. Ft | ft²	20,536
Investment Amount	$ 13,517,000
Parking Tenant	ISOM Management
MVP PF Memphis Poplar [Member]
Location	Memphis, TN
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	127
Property Size (Acres) | a	0.87
Investment Amount	$ 3,669,000
Parking Tenant	Best Park
MVP PF St. Louis [Member]
Location	St Louis, MO
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	183
Property Size (Acres) | a	1.22
Investment Amount	$ 5,041,000
Parking Tenant	SP +
Mabley Place Garage [Member]
Location	Cincinnati, OH
Date Acquired	12/15/2017
Property Type	Garage
# Spaces	775
Property Size (Acres) | a	0.9
Retail Sq. Ft | ft²	8,400
Investment Amount	$ 18,210,000
Parking Tenant	SP +
MVP Denver Sherman [Member]
Location	Denver, CO
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	28
Property Size (Acres) | a	0.14
Investment Amount	$ 705,000
Parking Tenant	Denver School
MVP Fort Worth Taylor [Member]
Location	Fort Worth, TX
Date Acquired	12/15/2017
Property Type	Garage
# Spaces	1,013
Property Size (Acres) | a	1.18
Retail Sq. Ft | ft²	11,828
Investment Amount	$ 27,663,000
Parking Tenant	SP +
MVP Milwaukee Old World [Member]
Location	Milwaukee, WI
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	54
Property Size (Acres) | a	0.26
Investment Amount	$ 2,044,000
Parking Tenant	SP +
MVP Houston Saks Garage [Member]
Location	Houston, TX
Date Acquired	12/15/2017
Property Type	Garage
# Spaces	265
Property Size (Acres) | a	0.36
Retail Sq. Ft | ft²	5,000
Investment Amount	$ 7,923,000
Parking Tenant	Premier Parking
MVP Milwaukee Wells [Member]
Location	Milwaukee, WI
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	148
Property Size (Acres) | a	1.07
Investment Amount	$ 4,463,000
Parking Tenant	Symphony
MVP Wildwood NJ Lot 1 [Member]
Location	Wildwood, NJ
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	29
Property Size (Acres) | a	0.26
Investment Amount	$ 278,000
Parking Tenant	SP +
MVP Wildwood NJ Lot 2 [Member]
Location	Wildwood, NJ
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	45
Property Size (Acres) | a	0.31
Investment Amount	$ 419,000
Parking Tenant	SP+
MVP Indianapolis City Park [Member]
Location	Indianapolis, IN
Date Acquired	12/15/2017
Property Type	Garage
# Spaces	370
Property Size (Acres) | a	0.47
Investment Amount	$ 10,934,000
Parking Tenant	Denison
MVP Indianapolis WA Street [Member]
Location	Indianapolis, IN
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	141
Property Size (Acres) | a	1.07
Investment Amount	$ 5,749,000
Parking Tenant	Denison
MVP Minneapolis Venture [Member]
Location	Minneapolis, MN
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	195
Property Size (Acres) | a	1.65
Investment Amount	$ 4,013,000
Parking Tenant	N/A
Minneapolis City Parking [Member]
Location	Minneapolis, MN
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	268
Property Size (Acres) | a	1.98
Investment Amount	$ 7,718,000
Parking Tenant	SP +
MVP Indianapolis Meridian [Member]
Location	Indianapolis, IN
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	36
Property Size (Acres) | a	0.24
Investment Amount	$ 1,551,000
Parking Tenant	Denison
MVP Milwaukee Clybourn [Member]
Location	Milwaukee, WI
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	15
Property Size (Acres) | a	0.06
Investment Amount	$ 262,000
Parking Tenant	Secure
MVP Milwaukee Arena Lot [Member]
Location	Milwaukee, WI
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	75
Property Size (Acres) | a	1.11
Investment Amount	$ 4,631,000
Parking Tenant	SP +
MVP Clarksburg Lot [Member]
Location	Clarksburg, WV
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	94
Property Size (Acres) | a	0.81
Investment Amount	$ 625,000
Parking Tenant	ABM
MVP Denver Sherman 1935 [Member]
Location	Denver, CO
Date Acquired	12/15/2017
Property Type	Lot
# Spaces	72
Property Size (Acres) | a	0.43
Investment Amount	$ 2,533,000
Parking Tenant	SP +
MVP Bridgeport Fairfield [Member]
Location	Bridgeport, CT
Date Acquired	12/15/2017
Property Type	Garage
# Spaces	878
Property Size (Acres) | a	1.01
Retail Sq. Ft | ft²	4,349
Investment Amount	$ 8,268,000
Parking Tenant	SP +
MVP New Orleans Rampart [Member]
Location	New Orleans, LA
Date Acquired	2/1/2018
Property Type	Lot
# Spaces	78
Property Size (Acres) | a	0.44
Investment Amount	$ 7,835,000
Parking Tenant	342 N. Rampart
MVP Hawaii Marks Garage [Member]
Location	Honolulu, HI
Date Acquired	6/21/2018
Property Type	Garage
# Spaces	311
Property Size (Acres) | a	0.77
Retail Sq. Ft | ft²	16,205
Investment Amount	$ 19,951,000
Parking Tenant	SP +
Construction in progress [Member]
Investment Amount	$ 1,151,000
Total Investment in real estate and fixed assets [Member]
Investment Amount	$ 295,210,000