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Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) segment $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares
Property, Plant and Equipment [Line Items] |  |  |
Vesting period (in years) | 5 years |  |
Expiration period of options (in years) | 10 years |  |
Number of operating segments | segment | 1 |  |
Common shares, par value (usd per share) | $ / shares | $ 0.0001 | $ 0.0001 |
OP unit equivalent in common shares (in unit per share) | 1.13 |  |
Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Maximum useful life of PPE (in years) | 40 years |  |
Lake Jackson, Texas [Member] | Office Building [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Redemption of noncontrolling interests | $ 7,951 |  |
Variable Interest Entity, Primary Beneficiary [Member] | Lake Jackson, Texas [Member] | Affiliated Entity [Member] | Office Building [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Redemption of noncontrolling interests | $ 7,951 |  |
LCIF [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
VIE, ownership percentage | 96.00% |  |
LCIF [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Redemption of noncontrolling interests | $ 129,990 | $ 0 | $ 0
Number of operating segments | segment | 1 |  |
Common shares, par value (usd per share) | $ / shares | $ 0.0001 |  |
OP unit equivalent in common shares (in unit per share) | 1.13 |  |
Distributions | $ 63,525 | $ 66,815 | $ 60,846
Distribution per weighted average unit (usd per share) | $ / shares | $ 0.77 | $ 0.80 | $ 0.84
LCIF [Member] | Limited Partner [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Share price (usd per share) | $ / shares | $ 9.65 |  |
Portion of LP, fair value | $ 35,021 |  |
LCIF [Member] | Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Maximum useful life of PPE (in years) | 40 years |  |

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