Property Plant and Equipment ("PP&E") - Summary of Property Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Homebuilding:
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 134,049	$ 130,468
Less: accumulated depreciation	(91,815)	(87,277)
Net Homebuilding PP&E	42,234	43,191
Homebuilding: | Office facilities and other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	37,789	35,219
Homebuilding: | Model home furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	31,593	33,901
Homebuilding: | Production facilities
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	64,667	61,348
Mortgage Banking:
Property, Plant and Equipment [Line Items]
Net Homebuilding PP&E	6,510	6,327
Mortgage Banking: | Office facilities and other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	13,724	14,069
Less: accumulated depreciation	(7,214)	(7,742)
Net Homebuilding PP&E	$ 6,510	$ 6,327