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Summary Information Concerning Indebtedness (Parenthetical) (Detail) - USD ($) | Dec. 31, 2017 | May 01, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Outstanding Principal |  | $ 784,640,000 |  | $ 750,188,000
Unsecured Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured credit facility borrowing capacity |  | 300,000,000 | $ 300,000,000 |
Outstanding Principal | [1] | $ 104,005,000 |  |
Secured Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured credit facility borrowing capacity |  |  |  | 312,500,000
Outstanding Principal | [2] |  |  | $ 150,000,000
[1] | The unsecured credit facility total capacity is $300,000, of which $104,005 was outstanding as of December 31, 2017.
[2] | The secured credit facility total capacity was $312,500, of which $150,000 was outstanding as of December 31, 2016.

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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 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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- 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 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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