Land Under Development - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) Lot Parcel	Jan. 31, 2017 USD ($) Lot
Real Estate [Abstract]
Acquisition costs of raw land parcel		$ 14,400
Number of lots expected to be produce from raw land parcel | Lot		90
Number of raw parcels of land owned | Parcel	4
Carrying value of raw parcels of land	$ 46,685
Number of finished lots expected to be developed from raw parcels of land | Lot	550
Aggregate additional funding commitments related to raw land property under joint development	$ 10,000
Expected development credits that will offset the aggregate additional funding commitments related to raw land property development	$ 5,400