Commitments and Contingencies - Minto Communities - Additional Information (Detail)	Apr. 30, 2016 ft² Residential_Unit	Apr. 22, 2016 a	Apr. 13, 2016 a	Mar. 31, 2016 ft² a Property	Feb. 18, 2016 a	Dec. 31, 2015 a
Loss Contingencies [Line Items]
Area of real estate property				1,700,000	0.37	160
Definitive Sales Contracts [Member]
Loss Contingencies [Line Items]
Area of real estate property						160
Definitive Sales Contracts [Member] | Minto Communities [Member]
Loss Contingencies [Line Items]
Number of units planned on definitive sales contracts | Property				3,400
Area of real estate property				1,600
Subsequent Event [Member]
Loss Contingencies [Line Items]
Area of real estate property		21	600
Subsequent Event [Member] | Definitive Sales Contracts [Member] | Minto Communities [Member]
Loss Contingencies [Line Items]
Number of residential units zoning and entitlements received | Residential_Unit	3,400
Area of commercial space zoning and entitlements received | ft²	215,000