Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liability	$ 86,199	$ 86
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax					$ 2,196
Operating Lease, Right-of-Use Asset		$ 79
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax					2,196
Other Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract cost	16,300		$ 17,000
Home Building [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liability	72,965		0
Customer deposits	142,634		138,246
Restricted cash and cash equivalents	19,609		16,982
Operating Lease, Right-of-Use Asset	65,519		0
Consolidated Joint Venture [Member] | Home Building [Member] | Other Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash and cash equivalents	$ 300		$ 320	$ 1,148	$ 1,069