Commitments and Contingencies (Contractual Commitments - Land Pipeline) - Additional Information (Detail) $ in Millions	Jul. 29, 2016 USD ($) a Buyer $ / a	Jun. 30, 2016 ft²	Feb. 18, 2016 a	Dec. 31, 2015 a
Loss Contingencies [Line Items]
Area of real estate property		1,500,000	0.37	148.35
Construction and Other Commitment [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Number of buyers | Buyer	8
Area of real estate property | a	4,100
Percentage area of real estate property	39.00%
Anticipated sale proceeds | $	$ 103
Anticipated revenue per acre | $ / a	25,000