Note 16 - Results of Quarterly Operations (Unaudited) - Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								11 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 13, 2014	Dec. 31, 2016	[1]	Dec. 31, 2015	[1]	Dec. 31, 2014
Revenues	$ 1,982,208	$ 1,692,391	$ 1,598,901	$ 1,203,235	$ 1,698,198	$ 659,200	$ 707,044	$ 475,671		$ 6,476,735		$ 3,540,113
Homebuilding gross margin	427,393	374,692	341,357	247,188	330,669	159,756	171,941	114,105	$ 618,383	1,390,630		776,471		$ 618,383
Net income	$ 166,961	$ 132,348	$ 112,760	$ 72,661	$ 77,529	$ 47,177	$ 57,198	$ 31,605	$ 215,865	$ 484,730		$ 213,509		$ 215,865
Basic income per common share (in dollars per share)	$ 1.44	$ 1.12	$ 0.95	$ 0.60	$ 0.64	$ 0.65	$ 0.80	$ 0.45	$ 2.94	$ 4.09		$ 2.51		$ 2.94
Diluted income per common share (in dollars per share)	$ 1.25	$ 0.97	$ 0.83	$ 0.52	$ 0.56	$ 0.59	$ 0.70	$ 0.40	$ 2.68	$ 3.60		$ 2.26		$ 2.68

[1] Per share amounts do not add across due to rounding differences in quarterly amounts and due to the impact of differences between the quarterly and annual weighted average share calculations.