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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Jan. 11, 2019 | Oct. 12, 2018 | Jul. 13, 2018 | Apr. 13, 2018 | Jan. 12, 2018 | Oct. 13, 2017 | Jul. 14, 2017 | Apr. 14, 2017 | Jan. 13, 2017 | Oct. 14, 2016 | Jul. 08, 2016 | Apr. 08, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percent of VIE |  |  |  |  |  |  |  |  |  |  |  |  | 93.80% |  |
Capitalized transaction costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,800 |  |
Intangibles including goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 12,100 | $ 12,100 |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 4,300 | 4,300 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 7,800 | 7,800 |
Accumulated amortization of identified intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 3,000 | 2,900 |
Amortization of in-place leases |  |  |  |  |  |  |  |  |  |  |  |  | 7,187 | 2,231 | $ 3,373
Cash and cash equivalents, restricted cash |  |  |  |  |  |  |  |  |  |  |  |  | 21,100 | 17,200 |
Liabilities related to assets held for sale |  |  |  |  |  |  |  |  |  |  |  |  | 11,200 |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  | 26,400 | 23,700 |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | 2,374,700 | 2,193,700 |
Accumulated amortization for deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  | 36,600 | 33,900 |
Operating loss carryforwards |  |  |  |  |  |  |  |  |  |  |  |  | 74,100 | 74,100 |
Operating loss carryforward, offset against tax and distribution requirements |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,000 |
Net investment in real estate U.S federal tax basis |  |  |  |  |  |  |  |  |  |  |  |  | 3,400,000 |  |
Net investment in notes receivable U.S federal tax basis |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,100 |  |
Tax status of Common Shares distributions deemed paid during the year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary income (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.137 | $ 1.657 | $ 1.471
Long-term capital gains (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | 0.000 | 0.718 | 0.000
Nondividend distributions (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | 0.000 | 0.000 | 0.179
Distributions declared per Common Share outstanding (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | 2.137 | $ 2.375 | $ 1.650
Quarterly distribution paid per common share (usd per share) |  | $ 0.55 | $ 0.55 | $ 0.55 | $ 0.4875 | $ 0.4875 | $ 0.4875 | $ 0.4875 | $ 0.4250 | $ 0.4250 | $ 0.4250 | $ 0.4250 | $ 0.487 |  |
Proceeds from insurance claims |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,943 | $ 3,626 | $ 1,145
Distributions of capital from unconsolidated joint ventures |  |  |  |  |  |  |  |  |  |  |  |  | 396 | 789 | 3,068
Fair Value, Inputs, Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable, fair value |  |  |  |  |  |  |  |  |  |  |  |  | 2,364,600 | 2,184,000 |
Identified Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of in-place leases |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | $ 100 | 200
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax status of Common Shares distributions deemed paid during the year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly distribution paid per common share (usd per share) | $ 0.55 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly distribution for tax purposes | $ 0.063000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2016-15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax status of Common Shares distributions deemed paid during the year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,000)

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