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Revolving Credit Facilities and Term Loans - Additional Information (Detail) - Unsecured Debt [Member] - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Apr. 30, 2015
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Covenant compliance | The Company was in compliance with these covenants at June 30, 2015. |
Revolving Credit Facility [Member] | Prime rate [Member] |  |
Debt Instrument [Line Items] |  |
Specified spread line of credit facility | 0.15% |
Revolving Credit Facility [Member] | LIBOR [Member] |  |
Debt Instrument [Line Items] |  |
Specified spread line of credit facility | 1.00% |
JP Morgan Securities, LLC and Wells Fargo Securities, LLC [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 | 0.20% |
Revolving credit facility maturity extension option | two six-month options to extend the maturity to June 2020 upon the Company’s request |
PNC Bank National Association [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured revolving credit facility | $ 50,000,000 |
Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Accordion feature |  | $ 600,000,000
Covenant compliance | The Company was in compliance with these covenants at June 30, 2015. |
Unsecured term loan |  | $ 400,000,000
Term loan maturity date | Apr. 30, 2017 |
Extension maturity period | with three one-year borrower options |
Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] | LIBOR [Member] |  |
Debt Instrument [Line Items] |  |
Specified spread line of credit facility | 1.10% |

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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 Extended additional maturity period. + 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 Revolving credit facility maturity extension option. + References No definition available. + Details
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- Definition Unsecured term loan maximum borrowing capacity. + References No definition available. + Details
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- 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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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + 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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- 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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