Property Plant and Equipment ("PP&E") - Summary of Property Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Homebuilding:
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 130,468	$ 126,344
Less: accumulated depreciation	(87,277)	(80,429)
Net Homebuilding PP&E	43,191	45,915
Homebuilding: | Office facilities and other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	35,219	33,352
Homebuilding: | Model home furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	33,901	34,924
Homebuilding: | Production facilities
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	61,348	58,068
Mortgage Banking:
Property, Plant and Equipment [Line Items]
Net Homebuilding PP&E	6,327	4,903
Mortgage Banking: | Office facilities and other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	14,069	11,379
Less: accumulated depreciation	(7,742)	(6,476)
Net Homebuilding PP&E	$ 6,327	$ 4,903