Land Under Development - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) lot parcel	Dec. 31, 2017 USD ($) lot parcel
Real Estate [Abstract]
Number of finished lots for use in homebuilding operations | lot	500	500
Number of raw parcels of land owned | parcel	3	4
Carrying value of raw parcels of land	$ 38,857	$ 34,212
Aggregate additional funding commitments related to raw land property under joint development	7,300
Expected development credits that will offset the aggregate additional funding commitments related to raw land property development	$ 4,600