Land Under Development - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) parcel lot	Dec. 31, 2019 USD ($) lot parcel
Real Estate [Abstract]
Number of finished lots for use in homebuilding operations | lot	500	650
Number of raw parcels of land owned | parcel	3	5
Carrying value of raw parcels of land	$ 62,790	$ 69,196
Aggregate additional funding commitments related to raw land property under joint development	5,100
Expected development credits that will offset the aggregate additional funding commitments related to raw land property development	$ 2,600