Variable Interest Entities - Total Risk of Loss Related to Contract Land Deposits (Detail) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Variable Interest Entity Reporting Entity Involvement Maximum Loss Exposure [Abstract]
Contract land deposits		$ 392,503	$ 411,150
Loss reserve on contract land deposits		(34,098)	(31,306)
Contract land deposits, net		358,405	379,844
Contingent obligations in the form of letters of credit		2,575	2,379
Specific performance obligations	[1]	1,505	1,505
Total risk of loss		$ 362,485	$ 383,728

[1] As of both June 30, 2017 and December 31, 2016, the Company was committed to purchase 10 finished lots under specific performance obligations.