Income Taxes - Deferred Income Taxes on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Other accrued expenses and contract land deposit reserve	$ 49,063	$ 76,498
Deferred compensation	4,743	7,075
Equity-based compensation expense	36,799	55,077
Inventory	9,393	13,514
Unrecognized tax benefit	14,351	23,954
Other	9,681	10,106
Total deferred tax assets	124,030	186,224
Less: Deferred tax liabilities	4,511	5,414
Net deferred tax asset	$ 119,519	$ 180,810