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Segment Information - Additional Information (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
homebuilder
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information [Line Items]                      
Number of business segments | segment                 3    
Number of homebuilders | homebuilder                 1    
Revenues $ 30,866 $ 33,136 $ 28,015 $ 22,305 $ 64,497 $ 47,207 $ 47,992 $ 37,618 $ 114,322 $ 197,314 $ 218,576
Concentration risk, percentage (more than)                 10.00%    
Real Estate                      
Segment Reporting Information [Line Items]                      
Revenues                 $ 20,923