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Single-family properties - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Property Subject to or Available for Operating Lease [Line Items]      
Net book value   $ 3,861,422,000 $ 505,713,000
Term of the non-cancelable lease agreements   1 year  
Recorded Grant Deed of Trust Not Received [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Net book value   120,645,000 131,819,000
Single-Family Properties [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Depreciation expense $ 21,000 $ 60,254,000 $ 2,111,000