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Significant accounting policies - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended 0 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2013
Segment
Property
Dec. 31, 2012
Property
Feb. 28, 2013
2,770 Property Contribution [Member]
Property
Dec. 31, 2012
2012 Offering [Member]
Property
Dec. 31, 2011
2012 Offering [Member]
2,770 Property Contribution [Member]
Dec. 31, 2013
2012 Offering [Member]
2,770 Property Contribution [Member]
Dec. 31, 2012
2012 Offering [Member]
2,770 Property Contribution [Member]
Dec. 31, 2013
Senior Secured Revolving Credit Facility [Member]
Dec. 31, 2013
Single-Family Properties Held for Sale [Member]
Property
Dec. 31, 2013
Class A Common Shares [Member]
Dec. 31, 2013
Improvements [Member]
Minimum [Member]
Dec. 31, 2013
Improvements [Member]
Maximum [Member]
Dec. 31, 2013
Buildings [Member]
Property Subject to or Available for Operating Lease [Line Items]                            
Percentage of likelihood of being realized upon ultimate settlement   50.00%                        
Unrecognized tax benefits   $ 0                        
Acquired leases term   Less than one year                        
Number of properties   23,268 3,644 2,770 367         44        
Long-lived assets, impairment charge   0                        
Lease amortization period   1 year                        
Estimated useful life of asset                       5 years 15 years 30 years
Impairment of intangible assets   0                        
Goodwill and other intangible assets, impairment   0                        
Maturity period for demand deposits, cashier's checks, money market accounts and certificates of deposit to be cash equivalents   Three months or less                        
Allowance for doubtful accounts   1,200,000 0                      
Rescission receivables   1,257,000 1,612,000                      
Term of lease   1 year                        
Stock options reclassified as grants to employees                     485,000      
Debt instrument, basis spread on variable rate                 2.75%          
Debt instrument variable interest rate, description                 30 day LIBOR plus          
Debt instrument, description of variable rate basis                 Company's credit facility bears variable interest at 30 day LIBOR plus 2.75% and was recently entered into on March 7, 2013 and further amended on September 30, 2013          
Allocated general and administrative expenses $ 47,000 $ 8,845,000 $ 7,199,000 $ 7,989,000   $ 47,000 $ 993,000 $ 6,949,000            
Number of reportable segments   1                        
Geographic market concentrations   The Company did not have any geographic market concentrations representing over 10% of total net book value of single-family properties.