Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 3 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,721,404	$ 1,514,750	$ 1,410,051	$ 1,246,588
Accumulated Depreciation And Amortization Description [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	1,662,484
Cost Capitalized Subsequent to Initial Investment	58,920
Land	870,119
Building and Improvements	851,285
Total Investment in Real Estate	1,721,404
Accumulated Depreciation and Amortization	$ 268,919
Date of Initial Leasehold or Acquisition Investment	2015
Accumulated Depreciation And Amortization Description [Member] | COLORADO [Member] | Louisville [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 6,605
Cost Capitalized Subsequent to Initial Investment	0
Land	5,228
Building and Improvements	1,377
Total Investment in Real Estate	6,605
Accumulated Depreciation and Amortization	$ 749
Date of Initial Leasehold or Acquisition Investment	2015
Accumulated Depreciation And Amortization Description [Member] | COLORADO [Member] | Monument [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,828
Cost Capitalized Subsequent to Initial Investment	(14)
Land	2,784
Building and Improvements	1,030
Total Investment in Real Estate	3,814
Accumulated Depreciation and Amortization	$ 445
Date of Initial Leasehold or Acquisition Investment	2017
Accumulated Depreciation And Amortization Description [Member] | COLORADO [Member] | Morrison [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 5,081
Land	3,018
Building and Improvements	2,063
Total Investment in Real Estate	5,081
Accumulated Depreciation and Amortization	$ 1,131
Date of Initial Leasehold or Acquisition Investment	2015
Accumulated Depreciation And Amortization Description [Member] | COLORADO [Member] | Superior [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,748
Land	2,477
Building and Improvements	1,271
Total Investment in Real Estate	3,748
Accumulated Depreciation and Amortization	$ 673
Date of Initial Leasehold or Acquisition Investment	2015
Accumulated Depreciation And Amortization Description [Member] | COLORADO [Member] | Thornton [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 5,003
Land	2,722
Building and Improvements	2,281
Total Investment in Real Estate	5,003
Accumulated Depreciation and Amortization	$ 1,210
Date of Initial Leasehold or Acquisition Investment	2015
Accumulated Depreciation And Amortization Description [Member] | COLORADO [Member] | Westminster [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,457
Land	752
Building and Improvements	705
Total Investment in Real Estate	1,457
Accumulated Depreciation and Amortization	$ 364
Date of Initial Leasehold or Acquisition Investment	2015
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Avon One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 731
Cost Capitalized Subsequent to Initial Investment	50
Land	403
Building and Improvements	378
Total Investment in Real Estate	781
Accumulated Depreciation and Amortization	$ 341
Date of Initial Leasehold or Acquisition Investment	2002
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Bridgeport One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 313
Cost Capitalized Subsequent to Initial Investment	298
Land	204
Building and Improvements	407
Total Investment in Real Estate	611
Accumulated Depreciation and Amortization	$ 380
Date of Initial Leasehold or Acquisition Investment	1985
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Bridgeport Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 350
Cost Capitalized Subsequent to Initial Investment	330
Land	228
Building and Improvements	452
Total Investment in Real Estate	680
Accumulated Depreciation and Amortization	$ 424
Date of Initial Leasehold or Acquisition Investment	1985
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Bridgeport Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 377
Cost Capitalized Subsequent to Initial Investment	391
Land	246
Building and Improvements	522
Total Investment in Real Estate	768
Accumulated Depreciation and Amortization	$ 495
Date of Initial Leasehold or Acquisition Investment	1985
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Bristol One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,594
Land	1,036
Building and Improvements	558
Total Investment in Real Estate	1,594
Accumulated Depreciation and Amortization	$ 428
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Brookfield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 57
Cost Capitalized Subsequent to Initial Investment	482
Land	20
Building and Improvements	519
Total Investment in Real Estate	539
Accumulated Depreciation and Amortization	$ 519
Date of Initial Leasehold or Acquisition Investment	1985
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Darien One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 667
Cost Capitalized Subsequent to Initial Investment	277
Land	434
Building and Improvements	510
Total Investment in Real Estate	944
Accumulated Depreciation and Amortization	$ 510
Date of Initial Leasehold or Acquisition Investment	1985
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Durham Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 994
Building and Improvements	994
Total Investment in Real Estate	994
Accumulated Depreciation and Amortization	$ 994
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | East Haven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,411
Land	1,315
Building and Improvements	3,096
Total Investment in Real Estate	4,411
Accumulated Depreciation and Amortization	$ 144
Date of Initial Leasehold or Acquisition Investment	2023
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Ellington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,295
Land	842
Building and Improvements	453
Total Investment in Real Estate	1,295
Accumulated Depreciation and Amortization	$ 347
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Hamden One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 645
Land	527
Building and Improvements	118
Total Investment in Real Estate	645
Accumulated Depreciation and Amortization	$ 28
Date of Initial Leasehold or Acquisition Investment	2018
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Hartford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 665
Land	432
Building and Improvements	233
Total Investment in Real Estate	665
Accumulated Depreciation and Amortization	$ 178
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Meriden One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,532
Land	989
Building and Improvements	543
Total Investment in Real Estate	1,532
Accumulated Depreciation and Amortization	$ 418
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Middletown One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 133
Cost Capitalized Subsequent to Initial Investment	418
Land	131
Building and Improvements	420
Total Investment in Real Estate	551
Accumulated Depreciation and Amortization	$ 408
Date of Initial Leasehold or Acquisition Investment	1987
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Milford [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,387
Land	2,217
Building and Improvements	1,170
Total Investment in Real Estate	3,387
Accumulated Depreciation and Amortization	$ 106
Date of Initial Leasehold or Acquisition Investment	2022
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Milford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 5,301
Land	2,192
Building and Improvements	3,109
Total Investment in Real Estate	5,301
Accumulated Depreciation and Amortization	$ 44
Date of Initial Leasehold or Acquisition Investment	2023
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | New Haven One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 538
Cost Capitalized Subsequent to Initial Investment	210
Land	351
Building and Improvements	397
Total Investment in Real Estate	748
Accumulated Depreciation and Amortization	$ 382
Date of Initial Leasehold or Acquisition Investment	1985
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | New Haven Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,413
Cost Capitalized Subsequent to Initial Investment	(160)
Land	568
Building and Improvements	685
Total Investment in Real Estate	1,253
Accumulated Depreciation and Amortization	$ 498
Date of Initial Leasehold or Acquisition Investment	1985
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Newington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 954
Land	620
Building and Improvements	334
Total Investment in Real Estate	954
Accumulated Depreciation and Amortization	$ 256
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | North Haven One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 90
Cost Capitalized Subsequent to Initial Investment	617
Land	365
Building and Improvements	342
Total Investment in Real Estate	707
Accumulated Depreciation and Amortization	$ 235
Date of Initial Leasehold or Acquisition Investment	1982
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [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	39
Land	332
Building and Improvements	218
Total Investment in Real Estate	550
Accumulated Depreciation and Amortization	$ 218
Date of Initial Leasehold or Acquisition Investment	1985
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Norwalk One [Member]
Schedule Of Investments In Real Estate [Line Items]
Cost Capitalized Subsequent to Initial Investment	$ 693
Land	402
Building and Improvements	291
Total Investment in Real Estate	693
Accumulated Depreciation and Amortization	$ 216
Date of Initial Leasehold or Acquisition Investment	1988
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Old Greenwich One [Member]
Schedule Of Investments In Real Estate [Line Items]
Cost Capitalized Subsequent to Initial Investment	$ 1,219
Land	620
Building and Improvements	599
Total Investment in Real Estate	1,219
Accumulated Depreciation and Amortization	$ 482
Date of Initial Leasehold or Acquisition Investment	1969
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Plymouth One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 931
Land	605
Building and Improvements	326
Total Investment in Real Estate	931
Accumulated Depreciation and Amortization	$ 250
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Shelton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,679
Land	1,645
Building and Improvements	2,034
Total Investment in Real Estate	3,679
Accumulated Depreciation and Amortization	$ 213
Date of Initial Leasehold or Acquisition Investment	2021
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | South Windham One [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	$ 953
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | South Windor [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 545
Land	337
Building and Improvements	208
Total Investment in Real Estate	545
Accumulated Depreciation and Amortization	$ 166
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Stamford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 603
Cost Capitalized Subsequent to Initial Investment	103
Land	393
Building and Improvements	313
Total Investment in Real Estate	706
Accumulated Depreciation and Amortization	$ 298
Date of Initial Leasehold or Acquisition Investment	1985
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Stamford Two [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	472
Land	330
Building and Improvements	649
Total Investment in Real Estate	979
Accumulated Depreciation and Amortization	$ 597
Date of Initial Leasehold or Acquisition Investment	1985
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Suffield One [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	$ 565
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Wallingford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 551
Land	335
Building and Improvements	216
Total Investment in Real Estate	551
Accumulated Depreciation and Amortization	$ 174
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Waterbury Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 804
Land	516
Building and Improvements	288
Total Investment in Real Estate	804
Accumulated Depreciation and Amortization	$ 223
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Watertown One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 925
Land	567
Building and Improvements	358
Total Investment in Real Estate	925
Accumulated Depreciation and Amortization	$ 286
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | West Haven One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,215
Land	790
Building and Improvements	425
Total Investment in Real Estate	1,215
Accumulated Depreciation and Amortization	$ 326
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | West Haven Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,099
Land	2,246
Building and Improvements	853
Total Investment in Real Estate	3,099
Accumulated Depreciation and Amortization	$ 79
Date of Initial Leasehold or Acquisition Investment	2022
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Westport One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 603
Cost Capitalized Subsequent to Initial Investment	12
Land	393
Building and Improvements	222
Total Investment in Real Estate	615
Accumulated Depreciation and Amortization	$ 223
Date of Initial Leasehold or Acquisition Investment	1985
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Willimantic One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 717
Land	466
Building and Improvements	251
Total Investment in Real Estate	717
Accumulated Depreciation and Amortization	$ 192
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Wilton One [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	203
Land	338
Building and Improvements	384
Total Investment in Real Estate	722
Accumulated Depreciation and Amortization	$ 378
Date of Initial Leasehold or Acquisition Investment	1985
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Windsor Locks One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,030
Land	670
Building and Improvements	360
Total Investment in Real Estate	1,030
Accumulated Depreciation and Amortization	$ 277
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | CONNECTICUT [Member] | Windsor Locks Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,433
Cost Capitalized Subsequent to Initial Investment	1,400
Land	1,055
Building and Improvements	1,778
Total Investment in Real Estate	2,833
Accumulated Depreciation and Amortization	$ 1,559
Date of Initial Leasehold or Acquisition Investment	2004
Accumulated Depreciation And Amortization Description [Member] | DISTRICT OF COLUMBIA [Member] | Washington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 848
Land	418
Building and Improvements	430
Total Investment in Real Estate	848
Accumulated Depreciation and Amortization	$ 224
Date of Initial Leasehold or Acquisition Investment	2013
Accumulated Depreciation And Amortization Description [Member] | DISTRICT OF COLUMBIA [Member] | Washington Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 940
Land	664
Building and Improvements	276
Total Investment in Real Estate	940
Accumulated Depreciation and Amortization	$ 165
Date of Initial Leasehold or Acquisition Investment	2013