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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