Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities	$ 85,674	$ 85,516
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax					$ 2,196
Operating lease right-of-use assets		$ 79,345
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	18,100		$ 17,000
Home Building [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities	70,864		0
Customer deposits	142,937		138,246
Restricted cash and cash equivalents	18,337		16,982
Operating lease right-of-use assets	63,505		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	$ 293		$ 320	$ 335	$ 1,069