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Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	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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