The Company and Financial Statement Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) Property state $ / shares	Jun. 30, 2017 USD ($) $ / shares	Dec. 31, 2017 $ / shares
Variable Interest Entity [Line Items]
Number of properties | Property	170
Number of states in which entity has interests | state	37
Common shares, par value (in dollars per share) | $ / shares	$ 0.0001		$ 0.0001
Partners capital equivalent in common shares	1.13
Net cash provided by operating activities	$ 110,881	$ 106,021
Net cash provided by investing activities	(22,017)	11,121
Net cash provided by financing activities	$ 54,083	105,703
Accounting Standards Update 2016-15 [Member]
Variable Interest Entity [Line Items]
Net cash provided by operating activities		55
Net cash provided by investing activities		6,369
Net cash provided by financing activities		1,627
LCIF [Member]
Variable Interest Entity [Line Items]
Percentage of outstanding units owned	96.00%
Number of properties | Property	31
Number of states in which entity has interests | state	19
Common shares, par value (in dollars per share) | $ / shares	$ 0.0001
Partners capital equivalent in common shares	1.13
Distributions	$ 29,906	$ 33,832
Distribution per weighted average unit (in dollars per share) | $ / shares	$ 0.37	$ 0.41
Net cash provided by operating activities	$ 19,179	$ 21,180
Net cash provided by investing activities	18,681	(43,123)
Net cash provided by financing activities	$ 7,589	$ 5,689
LCIF [Member] | Limited Partner [Member]
Variable Interest Entity [Line Items]
Share price (in dollars per share) | $ / shares	$ 8.73
Equity, fair value disclosure, portion of limited partner	$ 31,516
Variable Interest Entity, Primary Beneficiary [Member] | LCIF [Member]
Variable Interest Entity [Line Items]
VIE, ownership percentage	96.00%