Variable Interest Entities - Total Risk of Loss Related to Contract Land Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]
Contract land deposits	$ 441,423	$ 425,393
Loss reserve on contract land deposits	(27,572)	(29,216)
Contract land deposits, net	413,851	396,177
Contingent obligations in the form of letters of credit	5,606	3,923
Contingent specific performance obligations (1)	0	1,505
Total risk of loss	$ 419,457	$ 401,605