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Commitments and Contingencies (Contractual Commitments - Land Pipeline) - Additional Information (Detail) - 12 months ended Dec. 31, 2015
$ in Millions
USD ($)
a
ft²
Buyer
Loss Contingencies [Line Items]      
Area of a real estate property 160 1,700,000  
Construction and Other Commitment [Member]      
Loss Contingencies [Line Items]      
Number of buyers | Buyer     4
Area of a real estate property | a 1,700    
Percentage area of real estate property 16.00%    
Anticipated sale proceeds | $ $ 56.0