Income Taxes - Deferred Income Taxes on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Other accrued expenses and contract land deposit reserve	$ 51,316	$ 49,063
Deferred compensation	4,693	4,743
Equity-based compensation expense	40,744	36,799
Inventory	9,242	9,393
Unrecognized tax benefit	13,587	14,351
Other	5,113	9,681
Total deferred tax assets	124,695	124,030
Less: Deferred tax liabilities	6,091	4,511
Net deferred tax asset	$ 118,604	$ 119,519