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Summary Information Concerning Indebtedness (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Outstanding Principal | $ 909,404 |  | $ 784,640 |
Unamortized Discount and Debt Issuance Costs | (6,118) |  | (6,198) |
Carrying Amount | $ 903,286 |  | $ 778,442 |
Weighted Average Rate | 3.60% |  | 3.60% |
Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Maturity (in years) | 5 years 3 months 18 days |  | 5 years 8 months 12 days |
Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Principal | $ 619,399 |  | $ 580,635 |
Unamortized Discount and Debt Issuance Costs | (3,008) |  | (2,927) |
Carrying Amount | $ 616,391 |  | $ 577,708 |
Type | Fixed |  | Fixed |
Weighted Average Rate | 3.80% |  | 3.70% |
Mortgages | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Maturity (in years) | 5 years 8 months 12 days |  | 5 years 9 months 18 days |
Unsecured Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Principal | $ 190,005 | [1] | $ 104,005 | [2]
Unamortized Discount and Debt Issuance Costs | (2,216) | [1] | (2,376) | [2]
Carrying Amount | $ 187,789 | [1] | $ 101,629 | [2]
Type | Floating | [1] | Floating | [2]
Weighted Average Rate | 3.00% | [1] | 3.00% | [2]
Unsecured Credit Facility | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Maturity (in years) | 3 years 3 months 18 days | [1] | 3 years 9 months 18 days | [2]
Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Principal | $ 100,000 |  | $ 100,000 |
Unamortized Discount and Debt Issuance Costs | (894) |  | (895) |
Carrying Amount | $ 99,106 |  | $ 99,105 |
Type | Floating |  | Floating |
Weighted Average Rate | 3.20% |  | 3.20% |
Term Loan | Weighted Average |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted Average Maturity (in years) | 6 years 7 months 6 days |  | 6 years 10 months 24 days |
[1] | The unsecured credit facility total capacity is $300,000, of which $190,005 was outstanding as of March 31, 2018.
[2] | The secured credit facility total capacity was $300,000, of which $104,005 was outstanding as of December 31, 2017.

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- 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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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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