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Investment in and Advances to Non-Consolidated Entities - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2017 | Jul. 31, 2014 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Dec. 31, 2017 | Jan. 31, 2017 | Sep. 01, 2012
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Partnership carrying value in NLS |  |  | $ 70,879 |  | $ 70,879 |  |  | $ 17,476 |  |
Equity in earnings (losses) of non-consolidated entities |  |  | 4 | $ 283 | 192 | $ (1,064) |  |  |  |
Revenues |  |  | 99,958 | 97,689 | 308,088 | 289,472 |  |  |  |
Net income (loss) attributable to parent |  |  | 218,016 | 5,541 | 202,007 | 54,733 |  |  |  |
Net income (loss) attributable to noncontrolling interest |  |  | $ 2,834 | 55 | 3,225 | 448 |  |  |  |
Office Building [Member] | Transferred Property [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate gross disposition price |  |  |  |  | $ 967,799 | 190,368 |  |  |  |
NNN Office Joint Venture [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 20.00% |  | 20.00% |  |  |  |  |
Partnership carrying value in NLS |  |  | $ 53,571 |  | $ 53,571 |  |  | 0 |  |
NNN Office Joint Venture [Member] | 2 of 21 Transferred Properties [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of contributed property |  |  |  |  | 45,653 |  |  |  |  |
Payments to acquire interest in joint venture |  |  |  |  | 8,053 |  |  |  |  |
Gain (loss) on disposition of assets |  |  |  |  | 14,645 |  |  |  |  |
LCIF [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of non-consolidated entities |  |  | 82 | 79 | 406 | 338 |  |  |  |
Payments to acquire interest in joint venture |  |  |  |  | 8,017 |  |  |  |  |
Revenues |  |  | $ 19,815 | $ 21,242 | 63,596 | 61,169 |  |  |  |
LCIF [Member] | Office Building [Member] | Transferred Property [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of contributed property |  |  |  |  | 28,879 |  |  |  |  |
LCIF [Member] | NNN Office Joint Venture [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 13.74% |  |  |
Net income (loss) attributable to noncontrolling interest |  |  |  |  | (93) |  |  |  |  |
LCIF [Member] | NNN Office Joint Venture [Member] | 2 of 21 Transferred Properties [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of assets |  |  |  |  | 9,638 |  |  |  |  |
Net Lease Strategic Assets Fund L.P. [Member] | Office Building [Member] | Transferred Property [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of contributed property |  |  |  |  | $ 16,774 |  |  |  |  |
Net Lease Strategic Assets Fund L.P. [Member] | NNN Office Joint Venture [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 6.26% |  | 6.26% |  |  |  |  |
NNN Office Joint Venture [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, assets |  |  | $ 758,307 |  | $ 758,307 |  |  |  |  |
Equity method investment, liabilities |  |  | 490,451 |  | 490,451 |  |  |  |  |
Non-recourse debt |  |  | 466,200 |  | 466,200 |  |  |  |  |
Revenues |  |  |  |  | 5,974 |  |  |  |  |
Net income (loss) attributable to parent |  |  |  |  | (676) |  |  |  |  |
Equity Method Investments [Member] | LCIF [Member] | Net Lease Strategic Assets Fund L.P. [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Partnership carrying value in NLS |  |  | $ 5,794 |  | 5,794 |  |  | $ 6,175 |  |
Equity in earnings (losses) of non-consolidated entities |  |  |  |  | 484 | 323 |  |  |  |
Contributions to equity method investment |  |  |  |  | 68 | 1,067 |  |  |  |
Distributions received |  |  |  |  | $ 933 | 1,178 |  |  |  |
Equity Method Investments [Member] | LCIF [Member] | Net Lease Strategic Assets Fund L.P. [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  | 2.00%
Palm Beach Gardens, Florida [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  |  |  | $ 3,512 |  |  |  |
Philadelphia, Pennsylvania [Member] | LCIF [Member] | Office Building [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 1.00% |  |  |  |  |  |  |  |
Investment in non-consolidated entity |  | $ 263 |  |  |  |  |  |  |  |
Tenant-in-Common [Member] | Oklahoma City, Oklahoma [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  | 40.00% |
Proceeds from divestiture of interest in joint venture | $ 6,198 |  |  |  |  |  |  |  |  |
Gain on sale of properties | 1,452 |  |  |  |  |  |  |  |  |
Proceeds from collection of loans receivable | $ 8,420 |  |  |  |  |  |  |  |  |

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- Definition Value of property contributed in noncash investing and financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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