Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 18 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 970,964	$ 782,166	$ 783,233	$ 595,959
Accumulated Depreciation And Amortization Description [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	914,488
Cost Capitalized Subsequent to Initial Investment	56,476
Land	589,497
Building and Improvements	381,467
Total Investment in Real Estate	970,964
Accumulated Depreciation and Amortization	133,353
OREGON | Accumulated Depreciation And Amortization Description [Member] | Salem One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	1,071
Land	399
Building and Improvements	672
Total Investment in Real Estate	1,071
Accumulated Depreciation and Amortization	$ 126
Date of Initial Leasehold or Acquisition Investment	2015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Salem Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,350
Land	521
Building and Improvements	829
Total Investment in Real Estate	1,350
Accumulated Depreciation and Amortization	$ 124
Date of Initial Leasehold or Acquisition Investment	2015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Salem Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,408
Land	524
Building and Improvements	884
Total Investment in Real Estate	1,408
Accumulated Depreciation and Amortization	$ 137
Date of Initial Leasehold or Acquisition Investment	2015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Silverton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 956
Land	456
Building and Improvements	500
Total Investment in Real Estate	956
Accumulated Depreciation and Amortization	$ 20
Date of Initial Leasehold or Acquisition Investment	2017
OREGON | Accumulated Depreciation And Amortization Description [Member] | Salem Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,215
Land	3,182
Building and Improvements	1,033
Total Investment in Real Estate	4,215
Accumulated Depreciation and Amortization	$ 163
Date of Initial Leasehold or Acquisition Investment	2015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Salem Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,614
Land	3,517
Building and Improvements	1,097
Total Investment in Real Estate	4,614
Accumulated Depreciation and Amortization	$ 162
Date of Initial Leasehold or Acquisition Investment	2015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Stayton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 543
Land	296
Building and Improvements	247
Total Investment in Real Estate	543
Accumulated Depreciation and Amortization	$ 11
Date of Initial Leasehold or Acquisition Investment	2017
OREGON | 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	$ 1,398
Land	796
Building and Improvements	602
Total Investment in Real Estate	1,398
Accumulated Depreciation and Amortization	$ 109
Date of Initial Leasehold or Acquisition Investment	2015
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Allentown One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 358
Cost Capitalized Subsequent to Initial Investment	31
Land	233
Building and Improvements	156
Total Investment in Real Estate	389
Accumulated Depreciation and Amortization	$ 130
Date of Initial Leasehold or Acquisition Investment	1985
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Allison Park One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,500
Land	850
Building and Improvements	650
Total Investment in Real Estate	1,500
Accumulated Depreciation and Amortization	$ 394
Date of Initial Leasehold or Acquisition Investment	2010
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Harrisburg One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 399
Cost Capitalized Subsequent to Initial Investment	213
Land	199
Building and Improvements	413
Total Investment in Real Estate	612
Accumulated Depreciation and Amortization	$ 321
Date of Initial Leasehold or Acquisition Investment	1989
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | New Kensington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,375
Land	675
Building and Improvements	700
Total Investment in Real Estate	1,375
Accumulated Depreciation and Amortization	$ 238
Date of Initial Leasehold or Acquisition Investment	2010
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lancaster One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 642
Cost Capitalized Subsequent to Initial Investment	18
Land	300
Building and Improvements	360
Total Investment in Real Estate	660
Accumulated Depreciation and Amortization	$ 360
Date of Initial Leasehold or Acquisition Investment	1989
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Philadelphia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 405
Cost Capitalized Subsequent to Initial Investment	175
Land	264
Building and Improvements	316
Total Investment in Real Estate	580
Accumulated Depreciation and Amortization	$ 254
Date of Initial Leasehold or Acquisition Investment	1985
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Philadelphia Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,252
Land	814
Building and Improvements	438
Total Investment in Real Estate	1,252
Accumulated Depreciation and Amortization	$ 158
Date of Initial Leasehold or Acquisition Investment	2009
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Pottsville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 452
Cost Capitalized Subsequent to Initial Investment	1
Land	148
Building and Improvements	305
Total Investment in Real Estate	453
Accumulated Depreciation and Amortization	$ 304
Date of Initial Leasehold or Acquisition Investment	1990
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Reading One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 750
Cost Capitalized Subsequent to Initial Investment	49
Building and Improvements	799
Total Investment in Real Estate	799
Accumulated Depreciation and Amortization	$ 799
Date of Initial Leasehold or Acquisition Investment	1989
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Ballentine One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,246
Land	69
Building and Improvements	1,177
Total Investment in Real Estate	1,246
Accumulated Depreciation and Amortization	$ 16
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Blythewood One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,217
Land	2,405
Building and Improvements	812
Total Investment in Real Estate	3,217
Accumulated Depreciation and Amortization	$ 13
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Chapin One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,682
Land	1,135
Building and Improvements	547
Total Investment in Real Estate	1,682
Accumulated Depreciation and Amortization	$ 9
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Columbia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 464
Land	253
Building and Improvements	211
Total Investment in Real Estate	464
Accumulated Depreciation and Amortization	$ 3
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Columbia Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 792
Land	463
Building and Improvements	329
Total Investment in Real Estate	792
Accumulated Depreciation and Amortization	$ 5
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Columbia Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 868
Land	455
Building and Improvements	413
Total Investment in Real Estate	868
Accumulated Depreciation and Amortization	$ 7
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Columbia Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 927
Land	495
Building and Improvements	432
Total Investment in Real Estate	927
Accumulated Depreciation and Amortization	$ 5
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Columbia Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,643
Land	1,302
Building and Improvements	341
Total Investment in Real Estate	1,643
Accumulated Depreciation and Amortization	$ 4
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Columbia Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,460
Land	1,569
Building and Improvements	891
Total Investment in Real Estate	2,460
Accumulated Depreciation and Amortization	$ 14
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Columbia Seven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,637
Land	1,254
Building and Improvements	1,383
Total Investment in Real Estate	2,637
Accumulated Depreciation and Amortization	$ 19
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Columbia Eight [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,371
Land	2,016
Building and Improvements	1,355
Total Investment in Real Estate	3,371
Accumulated Depreciation and Amortization	$ 21
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Elgin One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,082
Land	1,166
Building and Improvements	916
Total Investment in Real Estate	2,082
Accumulated Depreciation and Amortization	$ 14
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Elgin Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,177
Land	974
Building and Improvements	1,203
Total Investment in Real Estate	2,177
Accumulated Depreciation and Amortization	$ 17
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Gaston One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,230
Land	934
Building and Improvements	1,296
Total Investment in Real Estate	2,230
Accumulated Depreciation and Amortization	$ 18
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Gilbert One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,036
Land	434
Building and Improvements	602
Total Investment in Real Estate	1,036
Accumulated Depreciation and Amortization	$ 8
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Irmo One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,114
Land	667
Building and Improvements	447
Total Investment in Real Estate	1,114
Accumulated Depreciation and Amortization	$ 6
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Irmo Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,339
Land	867
Building and Improvements	472
Total Investment in Real Estate	1,339
Accumulated Depreciation and Amortization	$ 7
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Irmo Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,655
Land	1,742
Building and Improvements	1,913
Total Investment in Real Estate	3,655
Accumulated Depreciation and Amortization	$ 27
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Irmo Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,950
Land	2,802
Building and Improvements	1,148
Total Investment in Real Estate	3,950
Accumulated Depreciation and Amortization	$ 17
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lexington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 633
Land	309
Building and Improvements	324
Total Investment in Real Estate	633
Accumulated Depreciation and Amortization	$ 5
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lexington Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 694
Land	172
Building and Improvements	522
Total Investment in Real Estate	694
Accumulated Depreciation and Amortization	$ 8
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lexington Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 720
Land	219
Building and Improvements	501
Total Investment in Real Estate	720
Accumulated Depreciation and Amortization	$ 7
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lexington Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 816
Land	336
Building and Improvements	480
Total Investment in Real Estate	816
Accumulated Depreciation and Amortization	$ 5
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lexington Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 973
Land	582
Building and Improvements	391
Total Investment in Real Estate	973
Accumulated Depreciation and Amortization	$ 6
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lexington Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,056
Land	432
Building and Improvements	624
Total Investment in Real Estate	1,056
Accumulated Depreciation and Amortization	$ 9
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lexington Seven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,624
Land	999
Building and Improvements	625
Total Investment in Real Estate	1,624
Accumulated Depreciation and Amortization	$ 9
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lexington Eight [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,712
Land	1,410
Building and Improvements	302
Total Investment in Real Estate	1,712
Accumulated Depreciation and Amortization	$ 4
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lexington Nine [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,729
Land	1,268
Building and Improvements	461
Total Investment in Real Estate	1,729
Accumulated Depreciation and Amortization	$ 8
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lexington Ten [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,738
Land	1,189
Building and Improvements	549
Total Investment in Real Estate	1,738
Accumulated Depreciation and Amortization	$ 6
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lexington Eleven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,179
Land	1,476
Building and Improvements	703
Total Investment in Real Estate	2,179
Accumulated Depreciation and Amortization	$ 10
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lexington Twelve [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,413
Land	3,418
Building and Improvements	995
Total Investment in Real Estate	4,413
Accumulated Depreciation and Amortization	$ 16
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Pelion One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,901
Land	1,021
Building and Improvements	880
Total Investment in Real Estate	1,901
Accumulated Depreciation and Amortization	$ 15
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Richland One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 575
Land	345
Building and Improvements	230
Total Investment in Real Estate	575
Accumulated Depreciation and Amortization	$ 3
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | W.Columbia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 412
Land	145
Building and Improvements	267
Total Investment in Real Estate	412
Accumulated Depreciation and Amortization	$ 4
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | W.Columbia Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,116
Land	50
Building and Improvements	1,066
Total Investment in Real Estate	1,116
Accumulated Depreciation and Amortization	$ 15
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | W.Columbia Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,436
Land	472
Building and Improvements	964
Total Investment in Real Estate	1,436
Accumulated Depreciation and Amortization	$ 14
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | W.Columbia Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,644
Land	1,283
Building and Improvements	361
Total Investment in Real Estate	1,644
Accumulated Depreciation and Amortization	$ 5
Date of Initial Leasehold or Acquisition Investment	2017
SOUTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | W.Columbia Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,046
Land	746
Building and Improvements	1,300
Total Investment in Real Estate	2,046
Accumulated Depreciation and Amortization	$ 18
Date of Initial Leasehold or Acquisition Investment	2017
RHODE ISLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Ashaway One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 619
Land	402
Building and Improvements	217
Total Investment in Real Estate	619
Accumulated Depreciation and Amortization	$ 114
Date of Initial Leasehold or Acquisition Investment	2004
RHODE ISLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Barrington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 490
Cost Capitalized Subsequent to Initial Investment	180
Land	319
Building and Improvements	351
Total Investment in Real Estate	670
Accumulated Depreciation and Amortization	$ 249
Date of Initial Leasehold or Acquisition Investment	1985
RHODE ISLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | East Providence One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,297
Cost Capitalized Subsequent to Initial Investment	(1,845)
Land	14
Building and Improvements	438
Total Investment in Real Estate	452
Accumulated Depreciation and Amortization	$ 29
Date of Initial Leasehold or Acquisition Investment	1985
RHODE ISLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | NProvidence One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 543
Cost Capitalized Subsequent to Initial Investment	158
Land	353
Building and Improvements	348
Total Investment in Real Estate	701
Accumulated Depreciation and Amortization	$ 237
Date of Initial Leasehold or Acquisition Investment	1985
TEXAS [Member] | Accumulated Depreciation And Amortization Description [Member] | Austin One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 462
Land	274
Building and Improvements	188
Total Investment in Real Estate	462
Accumulated Depreciation and Amortization	$ 125
Date of Initial Leasehold or Acquisition Investment	2007