Commitments and Contingencies (Contractual Commitments - Land Pipeline) - Additional Information (Detail) $ in Millions	May. 03, 2016 USD ($) a Buyer	Apr. 22, 2016 a	Apr. 13, 2016 a	Mar. 31, 2016 ft²	Feb. 18, 2016 a	Dec. 31, 2015 a
Loss Contingencies [Line Items]
Area of real estate property				1,700,000	0.37	160
Subsequent Event [Member]
Loss Contingencies [Line Items]
Area of real estate property		21	600
Construction and Other Commitment [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Number of buyers | Buyer	6
Area of real estate property	2,300
Percentage area of real estate property	22.00%
Anticipated sale proceeds | $	$ 68