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Variable Interest Entities - Total Risk of Loss Related to Contract Land Deposits (Detail)
$ in Thousands
Sep. 30, 2017
USD ($)
lot
Dec. 31, 2016
USD ($)
lot
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]    
Contract land deposits $ 397,330 $ 411,150
Loss reserve on contract land deposits (32,188) (31,306)
Contract land deposits, net 365,142 379,844
Contingent obligations in the form of letters of credit 2,315 2,379
Specific performance obligations 1,505 1,505
Total risk of loss $ 368,962 $ 383,728
Finished lots committed to purchase under specific performance obligations | lot 10 10