Variable Interest Entities - Total Risk of Loss Related to Contract Land Deposits (Detail) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Variable Interest Entity Reporting Entity Involvement Maximum Loss Exposure [Abstract]
Contract land deposits		$ 416,313	$ 385,534
Loss reserve on contract land deposits		(38,817)	(42,239)
Contract land deposits, net		377,496	343,295
Contingent obligations in the form of letters of credit		2,310	3,302
Contingent specific performance obligations	[1]	1,505	1,505
Total risk of loss		$ 381,311	$ 348,102

[1] As of both September 30, 2016 and December 31, 2015, the Company was committed to purchase 10 finished lots under specific performance obligations.