Variable Interest Entities - Total Risk Related to Lot Options (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Contract land deposits	$ 350,261		$ 350,750
Loss reserve on contract land deposits	(55,140)		(56,074)
Contract land deposits, net	295,121		294,676
Contingent obligations in the form of letters of credit	4,938		4,674
Contingent specific performance obligations	1,505	[1]	1,505	[1]
Total risk of loss	$ 301,564		$ 300,855

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