Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 2 (Detail) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 783,233	$ 595,959	$ 570,275	$ 562,316
Accumulated Depreciation And Amortization Description [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	715,783
Cost Capitalized Subsequent to Initial Investment	67,450
Land	476,387
Building and Improvements	306,846
Total Investment in Real Estate	783,233
Accumulated Depreciation and Amortization	107,370
CT | Accumulated Depreciation And Amortization Description [Member] | North Haven [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	0
Land	252
Building and Improvements	153
Total Investment in Real Estate	405
Accumulated Depreciation and Amortization	$ 78
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Norwalk [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 511
Cost Capitalized Subsequent to Initial Investment	57
Land	332
Building and Improvements	236
Total Investment in Real Estate	568
Accumulated Depreciation and Amortization	$ 174
Date of Initial Leasehold or Acquisition Investment	1985
CT | Accumulated Depreciation And Amortization Description [Member] | Norwalk [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 0
Cost Capitalized Subsequent to Initial Investment	943
Land	402
Building and Improvements	541
Total Investment in Real Estate	943
Accumulated Depreciation and Amortization	$ 145
Date of Initial Leasehold or Acquisition Investment	1988
CT | Accumulated Depreciation And Amortization Description [Member] | Norwich [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 107
Cost Capitalized Subsequent to Initial Investment	323
Land	44
Building and Improvements	386
Total Investment in Real Estate	430
Accumulated Depreciation and Amortization	$ 145
Date of Initial Leasehold or Acquisition Investment	1982
CT | Accumulated Depreciation And Amortization Description [Member] | Old Greenwich [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 0
Cost Capitalized Subsequent to Initial Investment	1,223
Land	620
Building and Improvements	603
Total Investment in Real Estate	1,223
Accumulated Depreciation and Amortization	$ 152
Date of Initial Leasehold or Acquisition Investment	1969
CT | Accumulated Depreciation And Amortization Description [Member] | Plainville [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 545
Cost Capitalized Subsequent to Initial Investment	0
Land	354
Building and Improvements	191
Total Investment in Real Estate	545
Accumulated Depreciation and Amortization	$ 85
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Plymouth [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 931
Cost Capitalized Subsequent to Initial Investment	0
Land	605
Building and Improvements	326
Total Investment in Real Estate	931
Accumulated Depreciation and Amortization	$ 146
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Ridgefield [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 402
Cost Capitalized Subsequent to Initial Investment	304
Land	167
Building and Improvements	539
Total Investment in Real Estate	706
Accumulated Depreciation and Amortization	$ 298
Date of Initial Leasehold or Acquisition Investment	1985
CT | Accumulated Depreciation And Amortization Description [Member] | Ridgefield [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 536
Cost Capitalized Subsequent to Initial Investment	466
Land	348
Building and Improvements	654
Total Investment in Real Estate	1,002
Accumulated Depreciation and Amortization	$ 251
Date of Initial Leasehold or Acquisition Investment	1985
CT | Accumulated Depreciation And Amortization Description [Member] | South Windham [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 644
Cost Capitalized Subsequent to Initial Investment	1,398
Land	598
Building and Improvements	1,444
Total Investment in Real Estate	2,042
Accumulated Depreciation and Amortization	$ 491
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | South Windsor [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 545
Cost Capitalized Subsequent to Initial Investment	0
Land	337
Building and Improvements	208
Total Investment in Real Estate	545
Accumulated Depreciation and Amortization	$ 108
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Stamford [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 507
Cost Capitalized Subsequent to Initial Investment	16
Land	330
Building and Improvements	193
Total Investment in Real Estate	523
Accumulated Depreciation and Amortization	$ 143
Date of Initial Leasehold or Acquisition Investment	1985
CT | Accumulated Depreciation And Amortization Description [Member] | Stamford [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 507
Cost Capitalized Subsequent to Initial Investment	377
Land	330
Building and Improvements	554
Total Investment in Real Estate	884
Accumulated Depreciation and Amortization	$ 216
Date of Initial Leasehold or Acquisition Investment	1985
CT | Accumulated Depreciation And Amortization Description [Member] | Stamford [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 604
Cost Capitalized Subsequent to Initial Investment	342
Land	393
Building and Improvements	553
Total Investment in Real Estate	946
Accumulated Depreciation and Amortization	$ 227
Date of Initial Leasehold or Acquisition Investment	1985
CT | Accumulated Depreciation And Amortization Description [Member] | Suffield [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 237
Cost Capitalized Subsequent to Initial Investment	603
Land	201
Building and Improvements	639
Total Investment in Real Estate	840
Accumulated Depreciation and Amortization	$ 469
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Tolland [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 108
Cost Capitalized Subsequent to Initial Investment	379
Land	44
Building and Improvements	443
Total Investment in Real Estate	487
Accumulated Depreciation and Amortization	$ 192
Date of Initial Leasehold or Acquisition Investment	1982
CT | Accumulated Depreciation And Amortization Description [Member] | Vernon [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,434
Cost Capitalized Subsequent to Initial Investment	0
Land	0
Building and Improvements	1,434
Total Investment in Real Estate	1,434
Accumulated Depreciation and Amortization	$ 1,434
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Wallingford [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 551
Cost Capitalized Subsequent to Initial Investment	0
Land	335
Building and Improvements	216
Total Investment in Real Estate	551
Accumulated Depreciation and Amortization	$ 116
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Waterbury [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 469
Cost Capitalized Subsequent to Initial Investment	0
Land	305
Building and Improvements	164
Total Investment in Real Estate	469
Accumulated Depreciation and Amortization	$ 73
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Waterbury [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 515
Cost Capitalized Subsequent to Initial Investment	0
Land	335
Building and Improvements	180
Total Investment in Real Estate	515
Accumulated Depreciation and Amortization	$ 81
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Waterbury [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 804
Cost Capitalized Subsequent to Initial Investment	0
Land	516
Building and Improvements	288
Total Investment in Real Estate	804
Accumulated Depreciation and Amortization	$ 134
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Watertown [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 352
Cost Capitalized Subsequent to Initial Investment	343
Land	204
Building and Improvements	491
Total Investment in Real Estate	695
Accumulated Depreciation and Amortization	$ 182
Date of Initial Leasehold or Acquisition Investment	1992
CT | Accumulated Depreciation And Amortization Description [Member] | Watertown [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 925
Cost Capitalized Subsequent to Initial Investment	0
Land	567
Building and Improvements	358
Total Investment in Real Estate	925
Accumulated Depreciation and Amortization	$ 189
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | West Haven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 185
Cost Capitalized Subsequent to Initial Investment	322
Land	74
Building and Improvements	433
Total Investment in Real Estate	507
Accumulated Depreciation and Amortization	$ 187
Date of Initial Leasehold or Acquisition Investment	1982
CT | Accumulated Depreciation And Amortization Description [Member] | West Haven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,215
Cost Capitalized Subsequent to Initial Investment	0
Land	790
Building and Improvements	425
Total Investment in Real Estate	1,215
Accumulated Depreciation and Amortization	$ 190
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Westbrook [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 345
Cost Capitalized Subsequent to Initial Investment	0
Land	0
Building and Improvements	345
Total Investment in Real Estate	345
Accumulated Depreciation and Amortization	$ 345
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Westport [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 604
Cost Capitalized Subsequent to Initial Investment	12
Land	393
Building and Improvements	223
Total Investment in Real Estate	616
Accumulated Depreciation and Amortization	$ 164
Date of Initial Leasehold or Acquisition Investment	1985
CT | Accumulated Depreciation And Amortization Description [Member] | Wethersfield [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 447
Cost Capitalized Subsequent to Initial Investment	0
Land	0
Building and Improvements	447
Total Investment in Real Estate	447
Accumulated Depreciation and Amortization	$ 447
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Willimantic [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 717
Cost Capitalized Subsequent to Initial Investment	0
Land	466
Building and Improvements	251
Total Investment in Real Estate	717
Accumulated Depreciation and Amortization	$ 112
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Wilton [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 519
Cost Capitalized Subsequent to Initial Investment	385
Land	338
Building and Improvements	566
Total Investment in Real Estate	904
Accumulated Depreciation and Amortization	$ 203
Date of Initial Leasehold or Acquisition Investment	1985
CT | Accumulated Depreciation And Amortization Description [Member] | Windsor Locks [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,031
Cost Capitalized Subsequent to Initial Investment	0
Land	670
Building and Improvements	361
Total Investment in Real Estate	1,031
Accumulated Depreciation and Amortization	$ 161
Date of Initial Leasehold or Acquisition Investment	2004
CT | Accumulated Depreciation And Amortization Description [Member] | Windsor Locks [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,434
Cost Capitalized Subsequent to Initial Investment	1,400
Land	1,055
Building and Improvements	1,779
Total Investment in Real Estate	2,834
Accumulated Depreciation and Amortization	$ 1,438
Date of Initial Leasehold or Acquisition Investment	2004
DC | Accumulated Depreciation And Amortization Description [Member] | Washington [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 848
Cost Capitalized Subsequent to Initial Investment	0
Land	418
Building and Improvements	430
Total Investment in Real Estate	848
Accumulated Depreciation and Amortization	$ 57
Date of Initial Leasehold or Acquisition Investment	2013
DC | Accumulated Depreciation And Amortization Description [Member] | Washington [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 941
Cost Capitalized Subsequent to Initial Investment	0
Land	664
Building and Improvements	277
Total Investment in Real Estate	941
Accumulated Depreciation and Amortization	$ 43
Date of Initial Leasehold or Acquisition Investment	2013
DE | Accumulated Depreciation And Amortization Description [Member] | Wilmington [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 382
Cost Capitalized Subsequent to Initial Investment	187
Land	249
Building and Improvements	320
Total Investment in Real Estate	569
Accumulated Depreciation and Amortization	$ 166
Date of Initial Leasehold or Acquisition Investment	1985
FL | Accumulated Depreciation And Amortization Description [Member] | Jacksonville [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 545
Cost Capitalized Subsequent to Initial Investment	0
Land	256
Building and Improvements	289
Total Investment in Real Estate	545
Accumulated Depreciation and Amortization	$ 190
Date of Initial Leasehold or Acquisition Investment	2000
FL | Accumulated Depreciation And Amortization Description [Member] | Orlando [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 867
Cost Capitalized Subsequent to Initial Investment	34
Land	401
Building and Improvements	500
Total Investment in Real Estate	901
Accumulated Depreciation and Amortization	$ 311
Date of Initial Leasehold or Acquisition Investment	2000
HI | Accumulated Depreciation And Amortization Description [Member] | Haleiwa [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,522
Cost Capitalized Subsequent to Initial Investment	0
Land	1,058
Building and Improvements	464
Total Investment in Real Estate	1,522
Accumulated Depreciation and Amortization	$ 269
Date of Initial Leasehold or Acquisition Investment	2007
HI | Accumulated Depreciation And Amortization Description [Member] | Honolulu [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,071
Cost Capitalized Subsequent to Initial Investment	15
Land	981
Building and Improvements	105
Total Investment in Real Estate	1,086
Accumulated Depreciation and Amortization	$ 66
Date of Initial Leasehold or Acquisition Investment	2007
HI | Accumulated Depreciation And Amortization Description [Member] | Honolulu [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,539
Cost Capitalized Subsequent to Initial Investment	0
Land	1,219
Building and Improvements	320
Total Investment in Real Estate	1,539
Accumulated Depreciation and Amortization	$ 145
Date of Initial Leasehold or Acquisition Investment	2007
HI | Accumulated Depreciation And Amortization Description [Member] | Honolulu [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,769
Cost Capitalized Subsequent to Initial Investment	0
Land	1,192
Building and Improvements	577
Total Investment in Real Estate	1,769
Accumulated Depreciation and Amortization	$ 241
Date of Initial Leasehold or Acquisition Investment	2007
HI | Accumulated Depreciation And Amortization Description [Member] | Honolulu [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 9,211
Cost Capitalized Subsequent to Initial Investment	0
Land	8,194
Building and Improvements	1,017
Total Investment in Real Estate	9,211
Accumulated Depreciation and Amortization	$ 439
Date of Initial Leasehold or Acquisition Investment	2007
HI | Accumulated Depreciation And Amortization Description [Member] | Kaneohe [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,364
Cost Capitalized Subsequent to Initial Investment	0
Land	822
Building and Improvements	542
Total Investment in Real Estate	1,364
Accumulated Depreciation and Amortization	$ 264
Date of Initial Leasehold or Acquisition Investment	2007
HI | Accumulated Depreciation And Amortization Description [Member] | Kaneohe [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,978
Cost Capitalized Subsequent to Initial Investment	128
Land	1,473
Building and Improvements	633
Total Investment in Real Estate	2,106
Accumulated Depreciation and Amortization	$ 255
Date of Initial Leasehold or Acquisition Investment	2007
HI | Accumulated Depreciation And Amortization Description [Member] | Waianae [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,520
Cost Capitalized Subsequent to Initial Investment	0
Land	648
Building and Improvements	872
Total Investment in Real Estate	1,520
Accumulated Depreciation and Amortization	$ 364
Date of Initial Leasehold or Acquisition Investment	2007
HI | Accumulated Depreciation And Amortization Description [Member] | Waianae [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,997
Cost Capitalized Subsequent to Initial Investment	0
Land	871
Building and Improvements	1,126
Total Investment in Real Estate	1,997
Accumulated Depreciation and Amortization	$ 473
Date of Initial Leasehold or Acquisition Investment	2007
HI | Accumulated Depreciation And Amortization Description [Member] | Waipahu [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,458
Cost Capitalized Subsequent to Initial Investment	0
Land	945
Building and Improvements	1,513
Total Investment in Real Estate	2,458
Accumulated Depreciation and Amortization	$ 606
Date of Initial Leasehold or Acquisition Investment	2007
MA | Accumulated Depreciation And Amortization Description [Member] | Andover [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 390
Cost Capitalized Subsequent to Initial Investment	0
Land	240
Building and Improvements	150
Total Investment in Real Estate	390
Accumulated Depreciation and Amortization	$ 25
Date of Initial Leasehold or Acquisition Investment	2014
MA | Accumulated Depreciation And Amortization Description [Member] | Arlington [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 519
Cost Capitalized Subsequent to Initial Investment	27
Land	338
Building and Improvements	208
Total Investment in Real Estate	546
Accumulated Depreciation and Amortization	$ 157
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Auburn [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 175
Cost Capitalized Subsequent to Initial Investment	195
Land	125
Building and Improvements	245
Total Investment in Real Estate	370
Accumulated Depreciation and Amortization	$ 105
Date of Initial Leasehold or Acquisition Investment	1986
MA | Accumulated Depreciation And Amortization Description [Member] | Auburn [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 0
Cost Capitalized Subsequent to Initial Investment	535
Land	388
Building and Improvements	147
Total Investment in Real Estate	535
Accumulated Depreciation and Amortization	$ 18
Date of Initial Leasehold or Acquisition Investment	1996
MA | Accumulated Depreciation And Amortization Description [Member] | Auburn [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 600
Cost Capitalized Subsequent to Initial Investment	0
Land	600
Building and Improvements	0
Total Investment in Real Estate	600
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Auburn [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 625
Cost Capitalized Subsequent to Initial Investment	0
Land	625
Building and Improvements	0
Total Investment in Real Estate	625
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Auburn [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 369
Cost Capitalized Subsequent to Initial Investment	262
Land	240
Building and Improvements	391
Total Investment in Real Estate	631
Accumulated Depreciation and Amortization	$ 154
Date of Initial Leasehold or Acquisition Investment	1991
MA | Accumulated Depreciation And Amortization Description [Member] | Auburn [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 725
Cost Capitalized Subsequent to Initial Investment	0
Land	725
Building and Improvements	0
Total Investment in Real Estate	725
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Auburn [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 800
Cost Capitalized Subsequent to Initial Investment	0
Land	0
Building and Improvements	800
Total Investment in Real Estate	800
Accumulated Depreciation and Amortization	$ 360
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Barre [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 536
Cost Capitalized Subsequent to Initial Investment	12
Land	348
Building and Improvements	200
Total Investment in Real Estate	548
Accumulated Depreciation and Amortization	$ 103
Date of Initial Leasehold or Acquisition Investment	1991
MA | Accumulated Depreciation And Amortization Description [Member] | Bedford [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,350
Cost Capitalized Subsequent to Initial Investment	0
Land	1,350
Building and Improvements	0
Total Investment in Real Estate	1,350
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Bellingham [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 734
Cost Capitalized Subsequent to Initial Investment	73
Land	476
Building and Improvements	331
Total Investment in Real Estate	807
Accumulated Depreciation and Amortization	$ 258
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Belmont [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 390
Cost Capitalized Subsequent to Initial Investment	29
Land	254
Building and Improvements	165
Total Investment in Real Estate	419
Accumulated Depreciation and Amortization	$ 126
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Billerica [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	115
Land	180
Building and Improvements	334
Total Investment in Real Estate	514
Accumulated Depreciation and Amortization	$ 261
Date of Initial Leasehold or Acquisition Investment	1986
MA | Accumulated Depreciation And Amortization Description [Member] | Bradford [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 650
Cost Capitalized Subsequent to Initial Investment	0
Land	650
Building and Improvements	0
Total Investment in Real Estate	650
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Burlington [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 600
Cost Capitalized Subsequent to Initial Investment	0
Land	600
Building and Improvements	0
Total Investment in Real Estate	600
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Burlington [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,250
Cost Capitalized Subsequent to Initial Investment	0
Land	1,250
Building and Improvements	0
Total Investment in Real Estate	1,250
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Chelmsford [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 715
Cost Capitalized Subsequent to Initial Investment	0
Land	0
Building and Improvements	715
Total Investment in Real Estate	715
Accumulated Depreciation and Amortization	$ 184
Date of Initial Leasehold or Acquisition Investment	2012
MA | Accumulated Depreciation And Amortization Description [Member] | Danvers [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 400
Cost Capitalized Subsequent to Initial Investment	0
Land	400
Building and Improvements	0
Total Investment in Real Estate	400
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Dracut [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 450
Cost Capitalized Subsequent to Initial Investment	0
Land	450
Building and Improvements	0
Total Investment in Real Estate	450
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Falmouth [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 519
Cost Capitalized Subsequent to Initial Investment	127
Land	458
Building and Improvements	188
Total Investment in Real Estate	646
Accumulated Depreciation and Amortization	$ 113
Date of Initial Leasehold or Acquisition Investment	1988
MA | Accumulated Depreciation And Amortization Description [Member] | Fitchburg [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 390
Cost Capitalized Subsequent to Initial Investment	33
Land	254
Building and Improvements	169
Total Investment in Real Estate	423
Accumulated Depreciation and Amortization	$ 102
Date of Initial Leasehold or Acquisition Investment	1992
MA | Accumulated Depreciation And Amortization Description [Member] | Foxborough [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 427
Cost Capitalized Subsequent to Initial Investment	98
Land	325
Building and Improvements	200
Total Investment in Real Estate	525
Accumulated Depreciation and Amortization	$ 127
Date of Initial Leasehold or Acquisition Investment	1990
MA | Accumulated Depreciation And Amortization Description [Member] | Framingham [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 400
Cost Capitalized Subsequent to Initial Investment	23
Land	260
Building and Improvements	163
Total Investment in Real Estate	423
Accumulated Depreciation and Amortization	$ 94
Date of Initial Leasehold or Acquisition Investment	1991
MA | Accumulated Depreciation And Amortization Description [Member] | Gardner [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 550
Cost Capitalized Subsequent to Initial Investment	0
Land	550
Building and Improvements	0
Total Investment in Real Estate	550
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Gardner [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,009
Cost Capitalized Subsequent to Initial Investment	297
Land	657
Building and Improvements	649
Total Investment in Real Estate	1,306
Accumulated Depreciation and Amortization	$ 381
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Gardners [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 787
Cost Capitalized Subsequent to Initial Investment	0
Land	638
Building and Improvements	149
Total Investment in Real Estate	787
Accumulated Depreciation and Amortization	$ 14
Date of Initial Leasehold or Acquisition Investment	2014
MA | Accumulated Depreciation And Amortization Description [Member] | Hingham [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 353
Cost Capitalized Subsequent to Initial Investment	111
Land	243
Building and Improvements	221
Total Investment in Real Estate	464
Accumulated Depreciation and Amortization	$ 143
Date of Initial Leasehold or Acquisition Investment	1989
MA | Accumulated Depreciation And Amortization Description [Member] | Hyde Park [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 499
Cost Capitalized Subsequent to Initial Investment	158
Land	322
Building and Improvements	335
Total Investment in Real Estate	657
Accumulated Depreciation and Amortization	$ 174
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Leominster [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 571
Cost Capitalized Subsequent to Initial Investment	0
Land	199
Building and Improvements	372
Total Investment in Real Estate	571
Accumulated Depreciation and Amortization	$ 68
Date of Initial Leasehold or Acquisition Investment	2012
MA | Accumulated Depreciation And Amortization Description [Member] | Lowell [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 375
Cost Capitalized Subsequent to Initial Investment	9
Land	250
Building and Improvements	134
Total Investment in Real Estate	384
Accumulated Depreciation and Amortization	$ 134
Date of Initial Leasehold or Acquisition Investment	1986
MA | Accumulated Depreciation And Amortization Description [Member] | Lowell [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 361
Cost Capitalized Subsequent to Initial Investment	90
Land	201
Building and Improvements	250
Total Investment in Real Estate	451
Accumulated Depreciation and Amortization	$ 245
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Lowell [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1
Cost Capitalized Subsequent to Initial Investment	699
Land	429
Building and Improvements	271
Total Investment in Real Estate	700
Accumulated Depreciation and Amortization	$ 31
Date of Initial Leasehold or Acquisition Investment	1996
MA | Accumulated Depreciation And Amortization Description [Member] | Lynn [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 400
Cost Capitalized Subsequent to Initial Investment	0
Land	400
Building and Improvements	0
Total Investment in Real Estate	400
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Lynn [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 850
Cost Capitalized Subsequent to Initial Investment	0
Land	850
Building and Improvements	0
Total Investment in Real Estate	850
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Marlborough [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 550
Cost Capitalized Subsequent to Initial Investment	0
Land	550
Building and Improvements	0
Total Investment in Real Estate	550
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Maynard [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 736
Cost Capitalized Subsequent to Initial Investment	98
Land	479
Building and Improvements	355
Total Investment in Real Estate	834
Accumulated Depreciation and Amortization	$ 200
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Melrose [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 600
Cost Capitalized Subsequent to Initial Investment	0
Land	600
Building and Improvements	0
Total Investment in Real Estate	600
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Methuen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 300
Cost Capitalized Subsequent to Initial Investment	134
Land	150
Building and Improvements	284
Total Investment in Real Estate	434
Accumulated Depreciation and Amortization	$ 209
Date of Initial Leasehold or Acquisition Investment	1986
MA | Accumulated Depreciation And Amortization Description [Member] | Methuen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 380
Cost Capitalized Subsequent to Initial Investment	64
Land	246
Building and Improvements	198
Total Investment in Real Estate	444
Accumulated Depreciation and Amortization	$ 161
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Methuen [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	98
Land	319
Building and Improvements	269
Total Investment in Real Estate	588
Accumulated Depreciation and Amortization	$ 147
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Methuen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 650
Cost Capitalized Subsequent to Initial Investment	0
Land	650
Building and Improvements	0
Total Investment in Real Estate	650
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Newton [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 691
Cost Capitalized Subsequent to Initial Investment	366
Land	450
Building and Improvements	607
Total Investment in Real Estate	1,057
Accumulated Depreciation and Amortization	$ 254
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | North Andover [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 393
Cost Capitalized Subsequent to Initial Investment	33
Land	256
Building and Improvements	170
Total Investment in Real Estate	426
Accumulated Depreciation and Amortization	$ 131
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Oxford [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 293
Cost Capitalized Subsequent to Initial Investment	78
Land	178
Building and Improvements	193
Total Investment in Real Estate	371
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	1993
MA | Accumulated Depreciation And Amortization Description [Member] | Peabody [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 400
Cost Capitalized Subsequent to Initial Investment	18
Land	252
Building and Improvements	166
Total Investment in Real Estate	418
Accumulated Depreciation and Amortization	$ 166
Date of Initial Leasehold or Acquisition Investment	1986
MA | Accumulated Depreciation And Amortization Description [Member] | Peabody [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 550
Cost Capitalized Subsequent to Initial Investment	0
Land	550
Building and Improvements	0
Total Investment in Real Estate	550
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Peabody [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 650
Cost Capitalized Subsequent to Initial Investment	0
Land	650
Building and Improvements	0
Total Investment in Real Estate	650
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Pittsfield [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 123
Cost Capitalized Subsequent to Initial Investment	206
Land	50
Building and Improvements	279
Total Investment in Real Estate	329
Accumulated Depreciation and Amortization	$ 200
Date of Initial Leasehold or Acquisition Investment	1982
MA | Accumulated Depreciation And Amortization Description [Member] | Randolph [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 573
Cost Capitalized Subsequent to Initial Investment	195
Land	430
Building and Improvements	338
Total Investment in Real Estate	768
Accumulated Depreciation and Amortization	$ 207
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Revere [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,300
Cost Capitalized Subsequent to Initial Investment	0
Land	1,300
Building and Improvements	0
Total Investment in Real Estate	1,300
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Rockland [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 579
Cost Capitalized Subsequent to Initial Investment	45
Land	377
Building and Improvements	247
Total Investment in Real Estate	624
Accumulated Depreciation and Amortization	$ 190
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Salem [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 600
Cost Capitalized Subsequent to Initial Investment	0
Land	600
Building and Improvements	0
Total Investment in Real Estate	600
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Seekonk [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,073
Cost Capitalized Subsequent to Initial Investment	(301)
Land	576
Building and Improvements	196
Total Investment in Real Estate	772
Accumulated Depreciation and Amortization	$ 26
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Shrewsbury [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 400
Cost Capitalized Subsequent to Initial Investment	0
Land	400
Building and Improvements	0
Total Investment in Real Estate	400
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Shrewsbury [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 450
Cost Capitalized Subsequent to Initial Investment	0
Land	450
Building and Improvements	0
Total Investment in Real Estate	450
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Sterling [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 476
Cost Capitalized Subsequent to Initial Investment	2
Land	309
Building and Improvements	169
Total Investment in Real Estate	478
Accumulated Depreciation and Amortization	$ 87
Date of Initial Leasehold or Acquisition Investment	1991
MA | Accumulated Depreciation And Amortization Description [Member] | Sutton [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 714
Cost Capitalized Subsequent to Initial Investment	127
Land	464
Building and Improvements	377
Total Investment in Real Estate	841
Accumulated Depreciation and Amortization	$ 187
Date of Initial Leasehold or Acquisition Investment	1993
MA | Accumulated Depreciation And Amortization Description [Member] | Tewksbury [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 125
Cost Capitalized Subsequent to Initial Investment	521
Land	75
Building and Improvements	571
Total Investment in Real Estate	646
Accumulated Depreciation and Amortization	$ 121
Date of Initial Leasehold or Acquisition Investment	1986
MA | Accumulated Depreciation And Amortization Description [Member] | Tewksbury Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,200
Cost Capitalized Subsequent to Initial Investment	0
Land	1,200
Building and Improvements	0
Total Investment in Real Estate	1,200
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Upton [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 429
Cost Capitalized Subsequent to Initial Investment	114
Land	279
Building and Improvements	264
Total Investment in Real Estate	543
Accumulated Depreciation and Amortization	$ 110
Date of Initial Leasehold or Acquisition Investment	1991
MA | Accumulated Depreciation And Amortization Description [Member] | Wakefield [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 900
Cost Capitalized Subsequent to Initial Investment	0
Land	900
Building and Improvements	0
Total Investment in Real Estate	900
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Walpole [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 450
Cost Capitalized Subsequent to Initial Investment	92
Land	293
Building and Improvements	249
Total Investment in Real Estate	542
Accumulated Depreciation and Amortization	$ 131
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Watertown [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	212
Land	321
Building and Improvements	249
Total Investment in Real Estate	570
Accumulated Depreciation and Amortization	$ 128
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Webster [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,012
Cost Capitalized Subsequent to Initial Investment	842
Land	659
Building and Improvements	1,195
Total Investment in Real Estate	1,854
Accumulated Depreciation and Amortization	$ 405
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | West Boylston [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 312
Cost Capitalized Subsequent to Initial Investment	29
Land	203
Building and Improvements	138
Total Investment in Real Estate	341
Accumulated Depreciation and Amortization	$ 84
Date of Initial Leasehold or Acquisition Investment	1991
MA | Accumulated Depreciation And Amortization Description [Member] | West Roxbury [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	87
Land	319
Building and Improvements	258
Total Investment in Real Estate	577
Accumulated Depreciation and Amortization	$ 166
Date of Initial Leasehold or Acquisition Investment	1985
MA | Accumulated Depreciation And Amortization Description [Member] | Westborough [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 312
Cost Capitalized Subsequent to Initial Investment	21
Land	203
Building and Improvements	130
Total Investment in Real Estate	333
Accumulated Depreciation and Amortization	$ 76
Date of Initial Leasehold or Acquisition Investment	1991
MA | Accumulated Depreciation And Amortization Description [Member] | Westborough [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 450
Cost Capitalized Subsequent to Initial Investment	0
Land	450
Building and Improvements	0
Total Investment in Real Estate	450
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Westford [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 275
Cost Capitalized Subsequent to Initial Investment	65
Land	175
Building and Improvements	165
Total Investment in Real Estate	340
Accumulated Depreciation and Amortization	$ 136
Date of Initial Leasehold or Acquisition Investment	1986
MA | Accumulated Depreciation And Amortization Description [Member] | Wilmington [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 600
Cost Capitalized Subsequent to Initial Investment	0
Land	600
Building and Improvements	0
Total Investment in Real Estate	600
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011
MA | Accumulated Depreciation And Amortization Description [Member] | Wilmington [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,300
Cost Capitalized Subsequent to Initial Investment	0
Land	1,300
Building and Improvements	0
Total Investment in Real Estate	1,300
Accumulated Depreciation and Amortization	$ 0
Date of Initial Leasehold or Acquisition Investment	2011