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Subsequent events - Additional Information (Detail) (USD $) | 12 Months Ended | 2 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 | Mar. 07, 2014 Subsequent Events [Member] Property | Mar. 07, 2014 Subsequent Events [Member] Preferred Offering [Member]
Subsequent Event [Line Items] |  |  |
Number of properties acquired |  | 1,863 |
Aggregate purchase price of properties acquired |  | $ 253,806,000 |
Credit facility, additional borrowings, amount |  | 234,000,000 |
Credit facility, repayment, amount | 1,050,000,000 | 25,000,000 |
Credit facility, amount outstanding |  |  | $ 584,000,000

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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 increase (decrease) of the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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