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Debt - Unsecured Notes Payable - Additional Information (Details) - USD ($)		9 Months Ended	12 Months Ended
	Feb. 20, 2018	Sep. 30, 2018	Dec. 31, 2017	Jul. 31, 2018
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 300,000,000
Long-term debt outstanding		$ 1,491,869,000	$ 1,438,386,000
Letters of credit, outstanding amount		19,700,000	19,700,000
Core Portfolio
Debt Instrument [Line Items]
Derivative, notional amount		397,510,000
Fund Portfolio | Fund II
Debt Instrument [Line Items]
Derivative, notional amount		19,385,000
Fund Portfolio | Fund IV
Debt Instrument [Line Items]
Derivative, notional amount		180,974,000
Fund Portfolio | Fund V
Debt Instrument [Line Items]
Derivative, notional amount		86,570,000
Interest Rate Swaps
Debt Instrument [Line Items]
Derivative, notional amount		$ 50,000,000
Derivative fixed interest rate		2.80%
Interest Rate Swaps | Core Portfolio
Debt Instrument [Line Items]
Derivative, notional amount				$ 125,000,000
Unsecured Debt | Fund IV | Letter of Credit
Debt Instrument [Line Items]
Letters of credit, outstanding amount		$ 7,400,000	7,400,000
Unsecured Notes Payable | Unsecured Debt
Debt Instrument [Line Items]
Debt available balance		106,600,000	70,300,000
Unsecured Notes Payable | Unsecured Debt | Fund Portfolio | Fund II
Debt Instrument [Line Items]
Long-term debt outstanding		37,000,000	31,500,000
$300 Million Term Loan | Unsecured Debt | Core Portfolio
Debt Instrument [Line Items]
Maximum borrowing capacity	300,000,000
$350 Million Term Loan | Unsecured Debt | Core Portfolio
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 350,000,000
Long-term debt outstanding		350,000,000	300,000,000
$350 Million Term Loan | Unsecured Debt | Core Portfolio | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
Term Loan Maturing In September 2020 | Secured Debt | Fund II
Debt Instrument [Line Items]
Maximum borrowing capacity		40,000,000
Long-term line of credit, noncurrent		37,000,000	31,500,000
Remaining borrowing capacity		3,000,000	8,500,000
Bridge facility | Unsecured Debt | Fund IV
Debt Instrument [Line Items]
Maximum borrowing capacity		41,800,000
Long-term line of credit, noncurrent		40,800,000	40,800,000
Remaining borrowing capacity		1,000,000	1,000,000
Subscription Line | Unsecured Debt | Fund IV
Debt Instrument [Line Items]
Maximum borrowing capacity		21,500,000
Long-term line of credit, noncurrent		0	0
Remaining borrowing capacity		14,100,000	14,100,000
Subscription Line | Unsecured Debt | Fund V
Debt Instrument [Line Items]
Maximum borrowing capacity		150,000,000
Long-term line of credit, noncurrent		61,500,000
Remaining borrowing capacity		88,500,000
Subscription Line | Unsecured Debt | Fund Portfolio | Fund V
Debt Instrument [Line Items]
Long-term debt outstanding		$ 61,500,000	103,300,000
Remaining borrowing capacity			$ 46,700,000
Subscription Line | Unsecured Debt | Fund Portfolio | LIBOR | Fund V
Debt Instrument [Line Items]
Basis spread on variable rate		1.60%	1.60%

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Fixed interest rate related to the interest rate derivative.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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