Land Under Development - Additional Information (Detail) $ in Thousands	Sep. 30, 2019 USD ($) parcel lot
Real Estate [Abstract]
Inventory, Real Estate, Land Acquisition Costs	$ 44,700
Inventory, Real Estate, Land Acquisition Expected Lots | lot	400
Number of raw parcels of land owned | parcel	5
Carrying value of raw parcels of land	$ 80,193
Number of finished lots expected to be developed from raw parcels of land | lot	800
Aggregate additional funding commitments related to raw land property under joint development	$ 6,800
Expected development credits that will offset the aggregate additional funding commitments related to raw land property development	$ 2,900