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Commitments and Contingencies - Minto Communities - Additional Information (Detail) - Dec. 31, 2015
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Property
ft²
Loss Contingencies [Line Items]      
Area of real estate property 160   1,700,000
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