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Revolving Credit Facilities - Additional Information (Detail) - Unsecured Debt [Member] | 12 Months Ended
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Dec. 31, 2017 USD ($)
Revolving Credit Facility [Member] |
Debt Instrument [Line Items] |
Covenant compliance | The Company was in compliance with these financial covenants at December 31, 2017 and 2016.
Revolving Credit Facility [Member] | LIBOR [Member] |
Debt Instrument [Line Items] |
Specified spread line of credit facility | 1.20%
Revolving Credit Facility [Member] | Alternative Base Rate [Member] |
Debt Instrument [Line Items] |
Specified spread line of credit facility | 0.20%
J.P. Morgan Chase Bank, N.A., Wells Fargo Securities, LLC, Citizens Bank, N.A., RBC Capital Markets and U.S. Bank National Association [Member] | Revolving Credit Facility [Member] |
Debt Instrument [Line Items] |
Unsecured revolving credit facility borrowing capacity | $ 750,000,000
Accordion feature | $ 1,250,000,000
Line of credit facility competitive bid option on periodic interest rates | up to 50% of the facility
Facility fee | 0.25%
J.P. Morgan Chase Bank, N.A., Wells Fargo Securities, LLC, Citizens Bank, N.A., RBC Capital Markets and U.S. Bank National Association [Member] | Amended Revolving Credit Facility [Member] |
Debt Instrument [Line Items] |
Lines of Credit Maturity Date | 2021-09
Revolving credit facility maturity extension option | two six-month options to extend the maturity to September 2022 upon the Company’s request
J.P. Morgan Chase Bank, N.A., Wells Fargo Securities, LLC, Citizens Bank, N.A., RBC Capital Markets and U.S. Bank National Association [Member] | Maximum [Member] | Amended Revolving Credit Facility [Member] |
Debt Instrument [Line Items] |
Unsecured revolving credit facility borrowing capacity | $ 950,000,000
Accordion feature | $ 1,450,000,000
PNC Bank National Association [Member] | Revolving Credit Facility [Member] |
Debt Instrument [Line Items] |
Lines of Credit Maturity Date | 2021-09
PNC Bank National Association [Member] | Amended Revolving Credit Facility [Member] |
Debt Instrument [Line Items] |
Unsecured revolving credit facility | $ 50,000,000

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- Definition The increased amount of the facility the Company may expand to provided that new or existing lenders agree to the existing terms of the facility and increase their commitment level. + References No definition available. + Details
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- Definition Line of credit facility competitive bid option on periodic interest rates. + References No definition available. + Details
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- Definition Date when the revolving credit facility is scheduled to be fully repaid. + References No definition available. + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Identification of whether the entity has been in compliance with any credit facility debt covenants during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: 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(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 Reference 4: 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 5: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: 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 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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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