Schedule III - Real Estate and Accumulated Depreciation (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances
Initial cost to company, Land & Land improvements	1,852,482
Initial cost to company, Building & Improvements	1,013,134
Cost capitalized subsequent to acquisition, Carrying costs	77,203
Gross amount at which carried at close of period, Land, buildings & improvements Total	2,942,819
Accumulated depreciation	1,085,749
Rialto, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances
Initial cost to company, Land & Land improvements	274,837
Initial cost to company, Building & Improvements	150,310
Cost capitalized subsequent to acquisition, Carrying costs
Gross amount at which carried at close of period, Land, buildings & improvements Total	425,147
Accumulated depreciation	161,085
Date of construction	1984
Date acquired	1984
Moreno Valley, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances
Initial cost to company, Land & Land improvements	353,557
Initial cost to company, Building & Improvements	193,362
Cost capitalized subsequent to acquisition, Carrying costs
Gross amount at which carried at close of period, Land, buildings & improvements Total	546,919
Accumulated depreciation	207,221
Date of construction	1985
Date acquired	1985
La Verne, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances
Initial cost to company, Land & Land improvements	452,423
Initial cost to company, Building & Improvements	247,433
Cost capitalized subsequent to acquisition, Carrying costs
Gross amount at which carried at close of period, Land, buildings & improvements Total	699,856
Accumulated depreciation	265,166
Date of construction	1985
Date acquired	1985
Rancho Cucamonga, CA [Member] | Restaurant I [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances
Initial cost to company, Land & Land improvements	293,817
Initial cost to company, Building & Improvements	160,690
Cost capitalized subsequent to acquisition, Carrying costs	77,203
Gross amount at which carried at close of period, Land, buildings & improvements Total	531,710
Accumulated depreciation	172,201
Date of construction	1985
Date acquired	1985
Rancho Cucamonga, CA [Member] | Restaurant II [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances
Initial cost to company, Land & Land improvements	217,332
Initial cost to company, Building & Improvements	118,861
Cost capitalized subsequent to acquisition, Carrying costs
Gross amount at which carried at close of period, Land, buildings & improvements Total	336,193
Accumulated depreciation	127,384
Date of construction	1985
Date acquired	1985
Sacramento, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances
Initial cost to company, Land & Land improvements	260,516
Initial cost to company, Building & Improvements	142,478
Cost capitalized subsequent to acquisition, Carrying costs
Gross amount at which carried at close of period, Land, buildings & improvements Total	402,994
Accumulated depreciation	$ 152,692
Date of construction	1985
Date acquired	1985
Land improvements [Member] | Rialto, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statement is computed	20 years
Land improvements [Member] | Moreno Valley, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statement is computed	20 years
Land improvements [Member] | La Verne, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statement is computed	20 years
Land improvements [Member] | Rancho Cucamonga, CA [Member] | Restaurant I [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statement is computed	20 years
Land improvements [Member] | Rancho Cucamonga, CA [Member] | Restaurant II [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statement is computed	20 years
Land improvements [Member] | Sacramento, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statement is computed	20 years
Buildings and improvements [Member] | Rialto, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statement is computed	35 years
Buildings and improvements [Member] | Moreno Valley, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statement is computed	35 years
Buildings and improvements [Member] | La Verne, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statement is computed	35 years
Buildings and improvements [Member] | Rancho Cucamonga, CA [Member] | Restaurant I [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statement is computed	35 years
Buildings and improvements [Member] | Rancho Cucamonga, CA [Member] | Restaurant II [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statement is computed	35 years
Buildings and improvements [Member] | Sacramento, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statement is computed	35 years