Long-Term Debt - Notes Payable Landwell - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013
Debt Instrument [Line Items]
Notes payable outstanding	$ 965,000,000	$ 960,500,000
LandWell | Note payable to the City of Henderson
Debt Instrument [Line Items]
Debt instrument			$ 3,900,000
Periodic principal payments	$ 250,000
Interest rate terms	The loan bears interest at a 3% fixed rate.
Promissory note maturity date	Dec. 31, 2020
Frequency of debt instrument payment	semi-annual
Long-term promissory note fixed interest rate	3.00%
Notes payable outstanding	$ 2,900,000