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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Lot
Dec. 31, 2013
Lot
Commitment And Contingencies [Line Items]        
Accruals for asserted or unasserted matters     $ 0  
Reserve percentage to cover estimated costs     1.00%  
Non-refundable cash deposits pertaining to land option contracts     21.9 19.7
Purchase contracts for lots     1,224 1,184
Aggregate purchase price 255.7 262.1    
Surety bonds [Member]
       
Commitment And Contingencies [Line Items]        
Outstanding surety bonds $ 38.8 $ 41.4 $ 38.8 $ 41.4