Commitments and Contingencies - Minto Communities - Additional Information (Detail)	Jun. 30, 2016 ft² a Property	Apr. 30, 2016 ft² Residential_Unit	Feb. 18, 2016 a	Dec. 31, 2015 a
Loss Contingencies [Line Items]
Area of real estate property	1,500,000		0.37	148.35
Definitive Sales Contracts [Member]
Loss Contingencies [Line Items]
Area of real estate property				148.35
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
Number of residential units zoning and entitlements received | Residential_Unit		3,400
Area of commercial space zoning and entitlements received | ft²		215,000