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Real Estate and Intangible Assets - Summary Information of Farms (Detail) |  | 3 Months Ended
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Mar. 31, 2016 USD ($) a Farm | Mar. 31, 2016 USD ($) a Farm | Mar. 31, 2015 USD ($) a Farm
Real Estate Properties [Line Items] |  |  |
Number of Farms | Farm | 46 | 46 | 34
Total Acres | a | 23,003 | 23,003 | 8,789
Farm Acres | a | 17,953 | 17,953 |
Net Cost Basis | $ 250,895,407 | $ 250,895,407 |
Encumbrances | $ 160,776,919 | $ 160,776,919 |
Number of Farms | Farm |  | 3 | 2
2015 New Real Estate Activity [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Total Acreage | a |  |  | 750
Number of Farms | Farm |  |  | 2
Total Purchase Price |  |  | $ 20,818,780
Acquisition Costs |  |  | 193,495
Annualized Straight-line Rent |  |  | $ 1,030,174
San Andreas [Member] | Watsonville, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Jun. 16, 1997 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 307 | 307 |
Farm Acres | a | 238 | 238 |
Lease Expiration Date |  | Dec. 31, 2020 |
Net Cost Basis | $ 4,776,750 | $ 4,776,750 |
Encumbrances | $ 4,816,404 | $ 4,816,404 |
West Gonzales [Member] | Oxnard, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Sep. 15, 1998 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 653 | 653 |
Farm Acres | a | 502 | 502 |
Lease Expiration Date |  | Jun. 30, 2020 |
Net Cost Basis | $ 12,142,787 | $ 12,142,787 |
Encumbrances | $ 24,504,485 | $ 24,504,485 |
West Beach [Member] | Watsonville, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Jan. 03, 2011 |
Number of Farms | Farm |  | 3 |
Total Acres | a | 196 | 196 |
Farm Acres | a | 195 | 195 |
Lease Expiration Date |  | Dec. 31, 2023 |
Net Cost Basis | $ 9,292,113 | $ 9,292,113 |
Encumbrances | $ 4,691,842 | $ 4,691,842 |
Dalton Lane [Member] | Watsonville, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Jul. 07, 2011 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 72 | 72 |
Farm Acres | a | 70 | 70 |
Lease Expiration Date |  | Oct. 31, 2020 |
Net Cost Basis | $ 2,681,288 | $ 2,681,288 |
Encumbrances | $ 1,554,536 | $ 1,554,536 |
Keysville Road [Member] | Plant City, FL [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Oct. 26, 2011 |
Number of Farms | Farm |  | 2 |
Total Acres | a | 61 | 61 |
Farm Acres | a | 56 | 56 |
Lease Expiration Date |  | Jun. 30, 2020 |
Net Cost Basis | $ 1,240,187 | $ 1,240,187 |
Encumbrances | $ 897,600 | $ 897,600 |
Colding Loop [Member] | Wimauma, FL [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Aug. 09, 2012 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 219 | 219 |
Farm Acres | a | 181 | 181 |
Lease Expiration Date |  | Jun. 14, 2018 |
Net Cost Basis | $ 3,929,122 | $ 3,929,122 |
Encumbrances | $ 2,640,000 | $ 2,640,000 |
Trapnell Road [Member] | Plant City, FL [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Sep. 12, 2012 |
Number of Farms | Farm |  | 3 |
Total Acres | a | 124 | 124 |
Farm Acres | a | 110 | 110 |
Lease Expiration Date |  | Jun. 30, 2017 |
Net Cost Basis | $ 3,903,277 | $ 3,903,277 |
Encumbrances | $ 2,522,250 | $ 2,522,250 |
38th Avenue [Member] | Covert, MI [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Apr. 05, 2013 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 119 | 119 |
Farm Acres | a | 89 | 89 |
Lease Expiration Date |  | Apr. 04, 2020 |
Net Cost Basis | $ 1,265,366 | $ 1,265,366 |
Encumbrances | $ 742,391 | $ 742,391 |
Sequoia Street [Member] | Brooks, OR [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | May 31, 2013 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 218 | 218 |
Farm Acres | a | 206 | 206 |
Lease Expiration Date |  | May 31, 2028 |
Net Cost Basis | $ 3,100,817 | $ 3,100,817 |
Encumbrances | $ 1,716,191 | $ 1,716,191 |
Natividad Road [Member] | Salinas, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Oct. 21, 2013 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 166 | 166 |
Farm Acres | a | 166 | 166 |
Lease Expiration Date |  | Oct. 31, 2024 |
Net Cost Basis | $ 8,846,432 | $ 8,846,432 |
Encumbrances | $ 3,875,268 | $ 3,875,268 |
20th Avenue [Member] | South Haven, MI [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Nov. 05, 2013 |
Number of Farms | Farm |  | 3 |
Total Acres | a | 151 | 151 |
Farm Acres | a | 94 | 94 |
Lease Expiration Date |  | Nov. 04, 2018 |
Net Cost Basis | $ 1,871,211 | $ 1,871,211 |
Encumbrances | $ 1,107,219 | $ 1,107,219 |
Broadway Road [Member] | Moorpark, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Dec. 16, 2013 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 60 | 60 |
Farm Acres | a | 46 | 46 |
Lease Expiration Date |  | Dec. 15, 2023 |
Net Cost Basis | $ 2,878,356 | $ 2,878,356 |
Encumbrances | $ 1,660,829 | $ 1,660,829 |
Oregon Trail [Member] | Echo, OR [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Dec. 27, 2013 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 1,895 | 1,895 |
Farm Acres | a | 1,640 | 1,640 |
Lease Expiration Date |  | Dec. 31, 2023 |
Net Cost Basis | $ 13,898,699 | $ 13,898,699 |
Encumbrances | $ 7,750,535 | $ 7,750,535 |
East Shelton [Member] | Willcox, AZ [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Dec. 27, 2013 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 1,761 | 1,761 |
Farm Acres | a | 1,320 | 1,320 |
Lease Expiration Date |  | Feb. 29, 2024 |
Net Cost Basis | $ 7,827,371 | $ 7,827,371 |
Encumbrances | $ 3,709,185 | $ 3,709,185 |
Collins Road [Member] | Clatskanie, OR [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | May 30, 2014 |
Number of Farms | Farm |  | 2 |
Total Acres | a | 200 | 200 |
Farm Acres | a | 157 | 157 |
Lease Expiration Date |  | Sep. 30, 2024 |
Net Cost Basis | $ 2,396,272 | $ 2,396,272 |
Encumbrances | $ 1,494,746 | $ 1,494,746 |
Spring Valley [Member] | Watsonville, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Jun. 13, 2014 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 145 | 145 |
Farm Acres | a | 110 | 110 |
Lease Expiration Date |  | Sep. 30, 2022 |
Net Cost Basis | $ 5,761,971 | $ 5,761,971 |
Encumbrances | $ 3,266,297 | $ 3,266,297 |
McIntosh Road [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Lease Expiration Date |  | Jun. 30, 2019 |
McIntosh Road [Member] | Dover, FL [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Jun. 20, 2014 |
Number of Farms | Farm |  | 2 |
Total Acres | a | 94 | 94 |
Farm Acres | a | 78 | 78 |
Lease Expiration Date |  | Jun. 30, 2019 |
Net Cost Basis | $ 2,464,544 | $ 2,464,544 |
Encumbrances | $ 1,519,620 | $ 1,519,620 |
Naumann Road [Member] | Oxnard, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Jul. 23, 2014 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 68 | 68 |
Farm Acres | a | 66 | 66 |
Lease Expiration Date |  | Jul. 31, 2017 |
Net Cost Basis | $ 6,799,261 | $ 6,799,261 |
Encumbrances | $ 3,814,369 | $ 3,814,369 |
Sycamore Road [Member] | Arvin, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Jul. 25, 2014 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 326 | 326 |
Farm Acres | a | 322 | 322 |
Lease Expiration Date |  | Oct. 31, 2024 |
Net Cost Basis | $ 6,868,186 | $ 6,868,186 |
Encumbrances | $ 3,210,936 | $ 3,210,936 |
Wauchula Road [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Farm Acres | a | 590 | 590 |
Wauchula Road [Member] | Duette, FL [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Sep. 29, 2014 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 808 | 808 |
Farm Acres | a | 590 | 590 |
Lease Expiration Date |  | Sep. 30, 2024 |
Net Cost Basis | $ 13,713,300 | $ 13,713,300 |
Encumbrances | $ 7,639,575 | $ 7,639,575 |
Santa Clara Avenue [Member] | Oxnard, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Oct. 29, 2014 |
Number of Farms | Farm |  | 2 |
Total Acres | a | 333 | 333 |
Farm Acres | a | 331 | 331 |
Lease Expiration Date |  | Jul. 31, 2017 |
Net Cost Basis | $ 24,206,436 | $ 24,206,436 |
Encumbrances | $ 13,840,241 | $ 13,840,241 |
Dufau Road [Member] | Oxnard, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Nov. 04, 2014 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 65 | 65 |
Farm Acres | a | 64 | 64 |
Lease Expiration Date |  | Nov. 03, 2017 |
Net Cost Basis | $ 6,046,279 | $ 6,046,279 |
Encumbrances | $ 3,675,000 | $ 3,675,000 |
Espinosa Road [Member] | Salinas, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Jan. 05, 2015 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 331 | 331 |
Farm Acres | a | 329 | 329 |
Lease Expiration Date |  | Oct. 31, 2016 |
Net Cost Basis | $ 16,450,268 | $ 16,450,268 |
Encumbrances | $ 10,178,000 | $ 10,178,000 |
Espinosa Road [Member] | 2015 New Real Estate Activity [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  |  | Jan. 05, 2015
Espinosa Road [Member] | 2015 New Real Estate Activity [Member] | Salinas, CA [Member] | Strawberries [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  |  | Jan. 05, 2015
Total Acreage | a |  |  | 331
Number of Farms | Farm |  |  | 1
Lease Term |  |  | 1 year 9 months 18 days
Total Purchase Price |  |  | $ 16,905,500
Acquisition Costs |  |  | 89,885
Annualized Straight-line Rent |  |  | $ 778,342
Parrish Road [Member] | Duette, FL [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Mar. 10, 2015 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 419 | 419 |
Farm Acres | a | 412 | 412 |
Lease Expiration Date |  | Jun. 30, 2025 |
Net Cost Basis | $ 4,235,980 | $ 4,235,980 |
Encumbrances | $ 2,374,680 | $ 2,374,680 |
Parrish Road [Member] | 2015 New Real Estate Activity [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  |  | Mar. 10, 2015
Parrish Road [Member] | 2015 New Real Estate Activity [Member] | Duette, FL [Member] | Strawberries [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  |  | Mar. 10, 2015
Total Acreage | a |  |  | 419
Number of Farms | Farm |  |  | 1
Lease Term |  |  | 10 years 3 months 18 days
Renewal Options |  |  | 5 years
Total Purchase Price |  |  | $ 3,913,280
Acquisition Costs |  |  | 103,610
Annualized Straight-line Rent |  |  | $ 251,832
Immokalee Exchange [Member] | Immokalee, FL [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Jun. 25, 2015 |
Number of Farms | Farm |  | 2 |
Total Acres | a | 2,678 | 2,678 |
Farm Acres | a | 1,644 | 1,644 |
Lease Expiration Date |  | Jun. 30, 2020 |
Net Cost Basis | $ 15,585,280 | $ 15,585,280 |
Encumbrances | $ 9,360,000 | $ 9,360,000 |
Holt County [Member] | Stuart, NE [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Aug. 20, 2015 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 1,276 | 1,276 |
Farm Acres | a | 1,052 | 1,052 |
Lease Expiration Date |  | Dec. 31, 2018 |
Net Cost Basis | $ 5,460,180 | $ 5,460,180 |
Encumbrances | $ 3,301,000 | $ 3,301,000 |
Rock County [Member] | Bassett, NE [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Aug. 20, 2015 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 1,283 | 1,283 |
Farm Acres | a | 1,049 | 1,049 |
Lease Expiration Date |  | Dec. 31, 2018 |
Net Cost Basis | $ 5,450,906 | $ 5,450,906 |
Encumbrances | $ 3,301,000 | $ 3,301,000 |
Bear Mountain [Member] | Arvin, CA [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Sep. 03, 2015 |
Number of Farms | Farm |  | 3 |
Total Acres | a | 854 | 854 |
Farm Acres | a | 841 | 841 |
Lease Expiration Date |  | Jan. 09, 2031 |
Net Cost Basis | $ 22,656,128 | $ 22,656,128 |
Encumbrances | $ 8,514,720 | $ 8,514,720 |
Corbitt Road [Member] | Immokalee, FL [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Nov. 02, 2015 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 691 | 691 |
Farm Acres | a | 390 | 390 |
Lease Expiration Date |  | Dec. 31, 2021 |
Net Cost Basis | $ 3,800,181 | $ 3,800,181 |
Encumbrances | $ 3,760,000 | $ 3,760,000 |
Reagan Road [Member] | Willcox, AZ [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Dec. 22, 2015 |
Number of Farms | Farm |  | 1 |
Total Acres | a | 1,239 | 1,239 |
Farm Acres | a | 875 | 875 |
Lease Expiration Date |  | Dec. 31, 2025 |
Net Cost Basis | $ 5,708,898 | $ 5,708,898 |
Encumbrances | $ 3,807,000 | $ 3,807,000 |
Gunbarrel Road [Member] | Alamosa CO [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Mar. 03, 2016 |
Number of Farms | Farm |  | 3 |
Total Acres | a | 6,191 | 6,191 |
Farm Acres | a | 4,730 | 4,730 |
Lease Expiration Date |  | Feb. 28, 2021 |
Net Cost Basis | $ 25,637,561 | $ 25,637,561 |
Encumbrances | 15,531,000 | $ 15,531,000 |
Gunbarrel Road [Member] | 2016 New Real Estate Activity [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Mar. 03, 2016 |
Gunbarrel Road [Member] | 2016 New Real Estate Activity [Member] | Alamosa CO [Member] | Potatoes [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquisition Date |  | Mar. 03, 2016 |
Total Acreage | a |  | 6,191 |
Number of Farms | Farm |  | 3 |
Lease Term |  | 5 years |
Renewal Options |  | 5 years |
Total Purchase Price |  | $ 25,735,815 |
Acquisition Costs | 88,889 | 88,889 |
Annualized Straight-line Rent |  | 1,590,614 |
Long-term Debt Issued | $ 15,531,000 | $ 15,531,000 |

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