Debt Extinguishment Costs

No definition available.

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Period Type:	duration

- Definition

debt instrument, basis spread on variable rate if additional investment grade rating is attained

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Represents the percentage of net proceeds raised in all future equity issuances used for computing the tangible net worth to be maintained as per the covenants of the debt instrument.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Represents the minimum required ratio of net operating income to debt service as per the covenants of the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the minimum required ratio of adjusted EBITDA to fixed charges as per the covenants of the debt instrument.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Represents the maximum ratio of aggregate debt to aggregate assets as per the covenants of the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the maximum ratio of recourse debt to aggregate assets as per the covenants of the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the maximum ratio of secured debt to aggregate assets as per the covenants of the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the minimum required ratio of unencumbered NOI to unsecured interest expense as per the covenants of the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the maximum ratio of unsecured debt to unencumbered assets as per the covenants of the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the specified amount for computing the tangible net worth to be maintained as per the covenants of the debt instrument.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Prepayment Of Principal, Minimum Amount

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt instrument term extension period.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Represents the maximum amount allowed to be distributed expressed as a percentage of funds from operations.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Unused Capacity, Commitment Fee Percentage if pricing structure is converted to be based on an investment-grade rating

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Number of additional extension periods.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Principal Prepayment Percentage

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

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Notes Payable - Additional Information (Detail)			3 Months Ended	9 Months Ended
Notes Payable - Additional Information (Detail)	Mar. 20, 2017 USD ($)	Feb. 14, 2017 USD ($)	Sep. 30, 2017 USD ($) swap extension	Sep. 30, 2017 USD ($) swap extension	Oct. 13, 2017 USD ($)	Jul. 13, 2017	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Credit facility maximum future borrowing capacity		$ 550,000,000
Principal amount			$ 666,979,000	$ 666,979,000			$ 502,476,000
Number of extensions \| extension			2
Extension period			6 years
Subsequent Event
Debt Instrument [Line Items]
Principal Prepayment Percentage					100.00%
Prepayment of principal minimum amount					$ 2,500,000
Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Eurodollar
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Number of extensions \| extension			2
Extension period			6 months
Unsecured Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Commitment fee percentage				0.15%
Commitment fee percentage if pricing structure is converted to be based on an investment-grade rating		0.125%
Unsecured Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Commitment fee percentage				0.30%
Commitment fee percentage if pricing structure is converted to be based on an investment-grade rating		0.30%
Unsecured Revolving Credit Facility \| Thirty-day LIBOR plus \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.10%
Basis spread on variable rate if additional investment grade rating attained		0.825%
Unsecured Revolving Credit Facility \| Thirty-day LIBOR plus \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
Basis spread on variable rate if additional investment grade rating attained		1.55%
Unsecured Revolving Credit Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		0.10%
Basis spread on variable rate if additional investment grade rating attained		0.00%
Unsecured Revolving Credit Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Basis spread on variable rate if additional investment grade rating attained		0.55%
$100M Term Loan Facility \| Thirty-day LIBOR plus
Debt Instrument [Line Items]
Basis spread on variable rate			1.20%
Principal amount			$ 100,000,000	$ 100,000,000			100,000,000
$100M Term Loan Facility \| Thirty-day LIBOR plus \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.20%		1.20%
Basis spread on variable rate if additional investment grade rating attained		0.90%
Number of derivative instruments \| swap			2	2
$100M Term Loan Facility \| Thirty-day LIBOR plus \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		1.70%		1.70%
Basis spread on variable rate if additional investment grade rating attained		1.75%
$100M Term Loan Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		0.20%
Basis spread on variable rate if additional investment grade rating attained		0.00%
$100M Term Loan Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		0.70%
Basis spread on variable rate if additional investment grade rating attained		0.75%
$225M Term Loan Facility \| Thirty-day LIBOR plus \| Minimum
Debt Instrument [Line Items]
Number of derivative instruments \| swap			2	2
Credit Facility
Debt Instrument [Line Items]
Maximum ratio of total indebtedness to total asset value			60.00%	60.00%
Maximum ratio of recourse debt to total asset			15.00%	15.00%
Minimum tangible net worth required			$ 760,740,750	$ 760,740,750
Minimum percentage of equity proceeds to be used in minimum tangible net worth calculation			75.00%	75.00%
Minimum ratio of EBITDA to fixed charges			1.50	1.50
Maximum ratio of unsecured debt to the value of the unencumbered asset pool			60.00%	60.00%
Minimum ratio of NOI unsecured interest expense			1.75	1.75
Funds from operations percentage			95.00%
$60M Term Loan \| Thirty-day LIBOR plus
Debt Instrument [Line Items]
Basis spread on variable rate			1.90%
Number of extensions \| extension				1
Extension period				1 year
Revolving Credit Facility \| Thirty-day LIBOR plus
Debt Instrument [Line Items]
Basis spread on variable rate			1.10%
Principal amount			$ 50,000,000	$ 50,000,000			0
Number of extensions \| extension				2
Extension period				6 months
Revolving Credit Facility \| Thirty-day LIBOR plus \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				1.10%
Revolving Credit Facility \| Thirty-day LIBOR plus \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				1.50%
$125M senior notes
Debt Instrument [Line Items]
Principal amount			$ 125,000,000	$ 125,000,000			0
Stated Interest Rate			3.93%	3.93%		3.93%
$100M Notes
Debt Instrument [Line Items]
Principal amount			$ 100,000,000	$ 100,000,000			100,000,000
Stated Interest Rate			4.29%	4.29%
Maximum ratio of secured debt to total asset value			40.00%	40.00%
Line of Credit \| 300 Million Credit Facility
Debt Instrument [Line Items]
Credit facility maximum future borrowing capacity			$ 300,000,000.0	$ 300,000,000.0
Line of Credit \| Unsecured Credit Facility \| 450 Million Senior Credit Facility
Debt Instrument [Line Items]
Credit facility maximum future borrowing capacity		$ 450,000,000
Line of Credit \| Term Loan \| $100M Term Loan Facility
Debt Instrument [Line Items]
Credit facility maximum future borrowing capacity		100,000,000
Line of Credit \| Term Loan \| $225M Term Loan Facility \| Thirty-day LIBOR plus
Debt Instrument [Line Items]
Basis spread on variable rate			1.50%
Principal amount			$ 225,000,000	$ 225,000,000			225,000,000
Maximum ratio of secured debt to total asset value			45.00%	45.00%
Line of Credit \| Term Loan \| $225M Term Loan Facility \| Thirty-day LIBOR plus \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				1.50%
Line of Credit \| Term Loan \| $225M Term Loan Facility \| Thirty-day LIBOR plus \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				2.25%
Line of Credit \| Revolving Credit Facility \| Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum future borrowing capacity		$ 350,000,000
Fixed Rate Debt \| $60M Term Loan
Debt Instrument [Line Items]
Principal amount			$ 60,000,000	$ 60,000,000
Debt service coverage ratio			110.00%
Fixed Rate Debt \| $60M Term Loan \| Thirty-day LIBOR plus
Debt Instrument [Line Items]
Principal amount			$ 59,087,000	$ 59,087,000			$ 59,674,000
Number of derivative instruments \| swap			2	2
Unsecured Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount			$ 50,000,000	$ 50,000,000
Additional availability			$ 300,000,000	$ 300,000,000
1065 Walnut Street
Debt Instrument [Line Items]
Repayments of debt	$ 9,700,000
1065 Walnut Street \| Prepayment Fees
Debt Instrument [Line Items]
Prepayment penalties	200,000
1065 Walnut Street \| Debt Premium Write Off
Debt Instrument [Line Items]
Prepayment penalties	$ 200,000