Variable Interest Entities - Total Risk of Loss Related to Contract Land Deposits (Detail) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Variable Interest Entity Reporting Entity Involvement Maximum Loss Exposure [Abstract]
Contract land deposits		$ 363,120	$ 350,750
Loss reserve on contract land deposits		(44,532)	(56,074)
Contract land deposits, net		318,588	294,676
Contingent obligations in the form of letters of credit		2,586	4,674
Contingent specific performance obligations	[1]	1,505	1,505
Total risk of loss		$ 322,679	$ 300,855

[1] As of both September 30, 2015 and December 31, 2014, the Company was committed to purchase 10 finished lots under specific performance obligations.