Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 19 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
Accumulated Depreciation And Amortization Description [Member] | Miscellaneous [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	45,846
Cost Capitalized Subsequent to Initial Investment	15,133
Land	21,703
Building and Improvements	39,276
Total Investment in Real Estate	60,979
Accumulated Depreciation and Amortization	26,242
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Garland Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	4,439
Land	439
Building and Improvements	4,000
Total Investment in Real Estate	4,439
Accumulated Depreciation and Amortization	$ 754
Date of Initial Leasehold or Acquisition Investment	2014
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Grand Prairie One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,413
Land	914
Building and Improvements	499
Total Investment in Real Estate	1,413
Accumulated Depreciation and Amortization	$ 20
Date of Initial Leasehold or Acquisition Investment	2018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Grand Prairie Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,000
Land	1,415
Building and Improvements	585
Total Investment in Real Estate	2,000
Accumulated Depreciation and Amortization	$ 22
Date of Initial Leasehold or Acquisition Investment	2018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | EL Paso Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,679
Land	1,085
Building and Improvements	594
Total Investment in Real Estate	1,679
Accumulated Depreciation and Amortization	$ 45
Date of Initial Leasehold or Acquisition Investment	2017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | EL Paso Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,816
Land	1,413
Building and Improvements	403
Total Investment in Real Estate	1,816
Accumulated Depreciation and Amortization	$ 35
Date of Initial Leasehold or Acquisition Investment	2017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | EL Paso Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,370
Land	1,767
Building and Improvements	603
Total Investment in Real Estate	2,370
Accumulated Depreciation and Amortization	$ 47
Date of Initial Leasehold or Acquisition Investment	2017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Ft Worth One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,115
Cost Capitalized Subsequent to Initial Investment	49
Land	866
Building and Improvements	1,298
Total Investment in Real Estate	2,164
Accumulated Depreciation and Amortization	$ 721
Date of Initial Leasehold or Acquisition Investment	2007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Garland One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,208
Land	1,504
Building and Improvements	704
Total Investment in Real Estate	2,208
Accumulated Depreciation and Amortization	$ 26
Date of Initial Leasehold or Acquisition Investment	2018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Garland Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,296
Land	245
Building and Improvements	3,051
Total Investment in Real Estate	3,296
Accumulated Depreciation and Amortization	$ 550
Date of Initial Leasehold or Acquisition Investment	2014
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Linden [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,160
Land	1,514
Building and Improvements	646
Total Investment in Real Estate	2,160
Accumulated Depreciation and Amortization	$ 25
Date of Initial Leasehold or Acquisition Investment	2018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Harker Heights One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,051
Cost Capitalized Subsequent to Initial Investment	(9)
Land	579
Building and Improvements	1,463
Total Investment in Real Estate	2,042
Accumulated Depreciation and Amortization	$ 1,144
Date of Initial Leasehold or Acquisition Investment	2007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Longview [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,660
Land	1,239
Building and Improvements	421
Total Investment in Real Estate	1,660
Accumulated Depreciation and Amortization	$ 16
Date of Initial Leasehold or Acquisition Investment	2018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Houston One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,689
Land	224
Building and Improvements	1,465
Total Investment in Real Estate	1,689
Accumulated Depreciation and Amortization	$ 735
Date of Initial Leasehold or Acquisition Investment	2007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Mesquite
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,687
Land	1,093
Building and Improvements	594
Total Investment in Real Estate	1,687
Accumulated Depreciation and Amortization	$ 23
Date of Initial Leasehold or Acquisition Investment	2018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Houston Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,803
Land	535
Building and Improvements	2,268
Total Investment in Real Estate	2,803
Accumulated Depreciation and Amortization	$ 220
Date of Initial Leasehold or Acquisition Investment	2016
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Keller One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,507
Land	996
Building and Improvements	1,511
Total Investment in Real Estate	2,507
Accumulated Depreciation and Amortization	$ 827
Date of Initial Leasehold or Acquisition Investment	2007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Nueces One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,526
Land	1,056
Building and Improvements	470
Total Investment in Real Estate	1,526
Accumulated Depreciation and Amortization	$ 36
Date of Initial Leasehold or Acquisition Investment	2017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Lewisville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 494
Land	110
Building and Improvements	384
Total Investment in Real Estate	494
Accumulated Depreciation and Amortization	$ 239
Date of Initial Leasehold or Acquisition Investment	2008
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Nueces Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,162
Land	1,729
Building and Improvements	433
Total Investment in Real Estate	2,162
Accumulated Depreciation and Amortization	$ 37
Date of Initial Leasehold or Acquisition Investment	2017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Nueces Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,400
Land	1,110
Building and Improvements	1,290
Total Investment in Real Estate	2,400
Accumulated Depreciation and Amortization	$ 99
Date of Initial Leasehold or Acquisition Investment	2017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Midlothian One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 429
Land	72
Building and Improvements	357
Total Investment in Real Estate	429
Accumulated Depreciation and Amortization	$ 229
Date of Initial Leasehold or Acquisition Investment	2007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Port Arthur One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,648
Land	505
Building and Improvements	2,143
Total Investment in Real Estate	2,648
Accumulated Depreciation and Amortization	$ 215
Date of Initial Leasehold or Acquisition Investment	2016
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Rowlett [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,284
Land	840
Building and Improvements	444
Total Investment in Real Estate	1,284
Accumulated Depreciation and Amortization	$ 16
Date of Initial Leasehold or Acquisition Investment	2018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | San Marcos One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,954
Land	251
Building and Improvements	1,703
Total Investment in Real Estate	1,954
Accumulated Depreciation and Amortization	$ 874
Date of Initial Leasehold or Acquisition Investment	2007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | San Patricio [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,138
Land	2,687
Building and Improvements	451
Total Investment in Real Estate	3,138
Accumulated Depreciation and Amortization	$ 39
Date of Initial Leasehold or Acquisition Investment	2017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Temple One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,405
Cost Capitalized Subsequent to Initial Investment	(10)
Land	1,205
Building and Improvements	1,190
Total Investment in Real Estate	2,395
Accumulated Depreciation and Amortization	$ 664
Date of Initial Leasehold or Acquisition Investment	2007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | The Colony One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,396
Land	337
Building and Improvements	4,059
Total Investment in Real Estate	4,396
Accumulated Depreciation and Amortization	$ 1,992
Date of Initial Leasehold or Acquisition Investment	2007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Texarkana [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,791
Land	992
Building and Improvements	799
Total Investment in Real Estate	1,791
Accumulated Depreciation and Amortization	$ 29
Date of Initial Leasehold or Acquisition Investment	2018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Waco One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,884
Land	894
Building and Improvements	2,990
Total Investment in Real Estate	3,884
Accumulated Depreciation and Amortization	$ 1,674
Date of Initial Leasehold or Acquisition Investment	2007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Texarkana One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,861
Land	1,197
Building and Improvements	664
Total Investment in Real Estate	1,861
Accumulated Depreciation and Amortization	$ 27
Date of Initial Leasehold or Acquisition Investment	2018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Texarkana Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,316
Land	1,643
Building and Improvements	673
Total Investment in Real Estate	2,316
Accumulated Depreciation and Amortization	$ 24
Date of Initial Leasehold or Acquisition Investment	2018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Travis [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,711
Land	1,364
Building and Improvements	347
Total Investment in Real Estate	1,711
Accumulated Depreciation and Amortization	$ 31
Date of Initial Leasehold or Acquisition Investment	2017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Wake Village [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,637
Land	685
Building and Improvements	952
Total Investment in Real Estate	1,637
Accumulated Depreciation and Amortization	$ 34
Date of Initial Leasehold or Acquisition Investment	2018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Watauga [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,771
Land	1,139
Building and Improvements	632
Total Investment in Real Estate	1,771
Accumulated Depreciation and Amortization	$ 24
Date of Initial Leasehold or Acquisition Investment	2018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | El Paso Seven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,168
Land	2,153
Building and Improvements	1,015
Total Investment in Real Estate	3,168
Accumulated Depreciation and Amortization	$ 80
Date of Initial Leasehold or Acquisition Investment	2017
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 649
Land	649
Total Investment in Real Estate	$ 649
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 656
Land	409
Building and Improvements	247
Total Investment in Real Estate	656
Accumulated Depreciation and Amortization	$ 87
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 712
Land	712
Total Investment in Real Estate	$ 712
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 735
Land	735
Total Investment in Real Estate	$ 735
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,327
Land	1,327
Total Investment in Real Estate	$ 1,327
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,388
Land	1,020
Building and Improvements	368
Total Investment in Real Estate	1,388
Accumulated Depreciation and Amortization	$ 131
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Seven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,582
Land	1,150
Building and Improvements	432
Total Investment in Real Estate	1,582
Accumulated Depreciation and Amortization	$ 140
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Eight [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,757
Land	1,313
Building and Improvements	444
Total Investment in Real Estate	1,757
Accumulated Depreciation and Amortization	$ 153
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Annandale One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,718
Land	1,718
Total Investment in Real Estate	$ 1,718
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Arlington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,083
Land	1,083
Total Investment in Real Estate	$ 1,083
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Arlington Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,464
Land	1,085
Building and Improvements	379
Total Investment in Real Estate	1,464
Accumulated Depreciation and Amortization	$ 126
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Arlington Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,014
Land	1,516
Building and Improvements	498
Total Investment in Real Estate	2,014
Accumulated Depreciation and Amortization	$ 160
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fairfax Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,348
Land	2,351
Building and Improvements	997
Total Investment in Real Estate	3,348
Accumulated Depreciation and Amortization	$ 302
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Farmville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,227
Land	622
Building and Improvements	605
Total Investment in Real Estate	1,227
Accumulated Depreciation and Amortization	$ 333
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fredericksburg One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,279
Land	469
Building and Improvements	810
Total Investment in Real Estate	1,279
Accumulated Depreciation and Amortization	$ 446
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fredericksburg Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,289
Cost Capitalized Subsequent to Initial Investment	30
Land	798
Building and Improvements	521
Total Investment in Real Estate	1,319
Accumulated Depreciation and Amortization	$ 288
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fredericksburg Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,716
Land	996
Building and Improvements	720
Total Investment in Real Estate	1,716
Accumulated Depreciation and Amortization	$ 397
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fredericksburg Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,623
Land	2,828
Building and Improvements	795
Total Investment in Real Estate	3,623
Accumulated Depreciation and Amortization	$ 438
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Glen Allen One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,037
Land	412
Building and Improvements	625
Total Investment in Real Estate	1,037
Accumulated Depreciation and Amortization	$ 344
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Glen Allen Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,077
Land	322
Building and Improvements	755
Total Investment in Real Estate	1,077
Accumulated Depreciation and Amortization	$ 416
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | King William One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,688
Land	1,068
Building and Improvements	620
Total Investment in Real Estate	1,688
Accumulated Depreciation and Amortization	$ 342
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Mechanicsville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 903
Land	273
Building and Improvements	630
Total Investment in Real Estate	903
Accumulated Depreciation and Amortization	$ 347
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Mechanicsville Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 957
Land	324
Building and Improvements	633
Total Investment in Real Estate	957
Accumulated Depreciation and Amortization	$ 371
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Mechanicsville Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,043
Land	223
Building and Improvements	820
Total Investment in Real Estate	1,043
Accumulated Depreciation and Amortization	$ 452
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Mechanicsville Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,125
Land	505
Building and Improvements	620
Total Investment in Real Estate	1,125
Accumulated Depreciation and Amortization	$ 342
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Mechanicsville Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,476
Land	876
Building and Improvements	600
Total Investment in Real Estate	1,476
Accumulated Depreciation and Amortization	$ 331
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Mechanicsville Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,677
Land	1,157
Building and Improvements	520
Total Investment in Real Estate	1,677
Accumulated Depreciation and Amortization	$ 286
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Montpelier One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,481
Cost Capitalized Subsequent to Initial Investment	(114)
Land	1,612
Building and Improvements	755
Total Investment in Real Estate	2,367
Accumulated Depreciation and Amortization	$ 416
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Norfolk One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 535
Cost Capitalized Subsequent to Initial Investment	(70)
Land	235
Building and Improvements	230
Total Investment in Real Estate	465
Accumulated Depreciation and Amortization	$ 230
Date of Initial Leasehold or Acquisition Investment	1990
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Petersburg One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,441
Land	816
Building and Improvements	625
Total Investment in Real Estate	1,441
Accumulated Depreciation and Amortization	$ 344
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Portsmouth One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 563
Cost Capitalized Subsequent to Initial Investment	33
Land	222
Building and Improvements	374
Total Investment in Real Estate	596
Accumulated Depreciation and Amortization	$ 366
Date of Initial Leasehold or Acquisition Investment	1990
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Richmond One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,132
Cost Capitalized Subsequent to Initial Investment	(41)
Land	506
Building and Improvements	585
Total Investment in Real Estate	1,091
Accumulated Depreciation and Amortization	$ 322
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Ruther Glen One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 466
Land	31
Building and Improvements	435
Total Investment in Real Estate	466
Accumulated Depreciation and Amortization	$ 240
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Sandston One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 722
Land	102
Building and Improvements	620
Total Investment in Real Estate	722
Accumulated Depreciation and Amortization	$ 342
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Spotsylvania One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,290
Land	490
Building and Improvements	800
Total Investment in Real Estate	1,290
Accumulated Depreciation and Amortization	$ 441
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Springfield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,257
Land	2,969
Building and Improvements	1,288
Total Investment in Real Estate	4,257
Accumulated Depreciation and Amortization	$ 386
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Arlington Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,062
Land	1,603
Building and Improvements	459
Total Investment in Real Estate	2,062
Accumulated Depreciation and Amortization	$ 146
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Ashland One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 840
Land	840
Total Investment in Real Estate	$ 840
Date of Initial Leasehold or Acquisition Investment	2005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Chesapeake One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 779
Cost Capitalized Subsequent to Initial Investment	(185)
Land	398
Building and Improvements	196
Total Investment in Real Estate	594
Accumulated Depreciation and Amortization	$ 72
Date of Initial Leasehold or Acquisition Investment	1990
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Chesapeake Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,004
Cost Capitalized Subsequent to Initial Investment	110
Land	385
Building and Improvements	729
Total Investment in Real Estate	1,114
Accumulated Depreciation and Amortization	$ 667
Date of Initial Leasehold or Acquisition Investment	1990
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fairfax One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,825
Land	1,190
Building and Improvements	635
Total Investment in Real Estate	1,825
Accumulated Depreciation and Amortization	$ 204
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fairfax Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,078
Land	1,365
Building and Improvements	713
Total Investment in Real Estate	2,078
Accumulated Depreciation and Amortization	$ 197
Date of Initial Leasehold or Acquisition Investment	2013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fairfax Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,454
Land	3,370
Building and Improvements	1,084
Total Investment in Real Estate	4,454
Accumulated Depreciation and Amortization	$ 328
Date of Initial Leasehold or Acquisition Investment	2013
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Tacoma One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 518
Land	518
Total Investment in Real Estate	$ 518
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Tacoma Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 671
Land	671
Total Investment in Real Estate	$ 671
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Tenino One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 937
Land	219
Building and Improvements	718
Total Investment in Real Estate	937
Accumulated Depreciation and Amortization	$ 144
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Vancouver One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,214
Land	163
Building and Improvements	1,051
Total Investment in Real Estate	1,214
Accumulated Depreciation and Amortization	$ 191
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Auburn One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,022
Land	1,965
Building and Improvements	1,057
Total Investment in Real Estate	3,022
Accumulated Depreciation and Amortization	$ 224
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Bellevue One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,725
Land	886
Building and Improvements	839
Total Investment in Real Estate	1,725
Accumulated Depreciation and Amortization	$ 178
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Chehalis One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,176
Land	313
Building and Improvements	863
Total Investment in Real Estate	1,176
Accumulated Depreciation and Amortization	$ 201
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Colfax One Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,800
Land	3,611
Building and Improvements	1,189
Total Investment in Real Estate	4,800
Accumulated Depreciation and Amortization	$ 253
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Federal Way One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,218
Land	2,973
Building and Improvements	1,245
Total Investment in Real Estate	4,218
Accumulated Depreciation and Amortization	$ 284
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Fife One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,181
Land	414
Building and Improvements	767
Total Investment in Real Estate	1,181
Accumulated Depreciation and Amortization	$ 176
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Kent One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,900
Land	2,066
Building and Improvements	834
Total Investment in Real Estate	2,900
Accumulated Depreciation and Amortization	$ 192
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Monroe One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,792
Land	1,556
Building and Improvements	1,236
Total Investment in Real Estate	2,792
Accumulated Depreciation and Amortization	$ 268
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Port Orchard One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,019
Land	161
Building and Improvements	1,858
Total Investment in Real Estate	2,019
Accumulated Depreciation and Amortization	$ 337
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Puyallup One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 831
Land	172
Building and Improvements	659
Total Investment in Real Estate	831
Accumulated Depreciation and Amortization	$ 162
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Puyallup Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,035
Land	465
Building and Improvements	1,570
Total Investment in Real Estate	2,035
Accumulated Depreciation and Amortization	$ 327
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Puyallup Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,050
Land	2,394
Building and Improvements	1,656
Total Investment in Real Estate	4,050
Accumulated Depreciation and Amortization	$ 430
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Renton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,485
Land	952
Building and Improvements	533
Total Investment in Real Estate	1,485
Accumulated Depreciation and Amortization	$ 153
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Seattle One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 717
Land	193
Building and Improvements	524
Total Investment in Real Estate	717
Accumulated Depreciation and Amortization	$ 107
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Seattle Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,884
Land	1,223
Building and Improvements	661
Total Investment in Real Estate	1,884
Accumulated Depreciation and Amortization	$ 135
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Silverdale One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,178
Land	1,217
Building and Improvements	961
Total Investment in Real Estate	2,178
Accumulated Depreciation and Amortization	$ 220
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Snohomish One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 955
Land	955
Total Investment in Real Estate	$ 955
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | South Bend One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 760
Land	121
Building and Improvements	639
Total Investment in Real Estate	760
Accumulated Depreciation and Amortization	$ 127
Date of Initial Leasehold or Acquisition Investment	2015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Wilbur One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 629
Land	153
Building and Improvements	476
Total Investment in Real Estate	629
Accumulated Depreciation and Amortization	$ 106
Date of Initial Leasehold or Acquisition Investment	2015