Business (Detail) $ / shares in Units, $ in Millions		12 Months Ended
	Jan. 08, 2016 USD ($)	Dec. 31, 2016 Segment $ / shares	Dec. 31, 2015 $ / shares	Apr. 12, 2013 $ / shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reportable segments (in segment) | Segment		4
Class of Stock [Line Items]
Principal Equityholders owned percentage		100.00%
Acadia Homes [Member]
Class of Stock [Line Items]
Number of lots acquired (in lot)	1,100
Purchase price | $	$ 83.6
Common Class A [Member]
Class of Stock [Line Items]
Common stock, par value (usd per share)		$ 0.00001	$ 0.00001	$ 0.00001
Principal Equityholders owned percentage		25.50%
Common Class B [Member]
Class of Stock [Line Items]
Common stock, par value (usd per share)		$ 0.00001	$ 0.00001
Principal Equityholders owned percentage		74.50%	73.40%