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Summary of Quarterly Results of Operations (Unaudited) - Summary of Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 64,497 | $ 47,207 | $ 47,992 | $ 37,618 | $ 105,392 | $ 32,185 | $ 43,625 | $ 37,374 | $ 197,314 | $ 218,576 | $ 238,164
Gross profit | 17,352 | 17,403 | (24,953) | 18,579 | 46,655 | 12,879 | 21,060 | 18,012 |  |  |
Operating income (loss) | 50,980 | 6,256 | 69,528 | 13,590 | 29,929 | (8,482) | 5,919 | (3,424) | 140,354 | 23,942 | 70,560
Equity in earnings of unconsolidated ventures | 2,251 | 3,637 | 188 | 47 | 4,470 | 2,909 | 5,584 | 3,045 | 6,123 | 16,008 | 8,685
Income (loss) before taxes | 51,069 | 7,163 | 26,591 | 5,992 | 26,747 | (13,711) | 3,382 | (8,204) | 92,346 | 8,890 | 57,547
Income (loss) discontinued operations, net of taxes | 563 | (7,164) | (2,048) | (8,216) | (39,482) | (106,937) | (36,992) | (2,719) | (16,865) | (186,130) | (19,609)
Net income (loss) attributable to Forestar Group Inc. | $ 43,745 | $ 9,665 | $ 9,614 | $ (4,376) | $ (6,166) | $ (164,216) | $ (34,507) | $ (8,158) | $ 58,648 | $ (213,047) | $ 16,583
Net income (loss) per share -- basic |  |  |  |  |  |  |  |  |  |  |
Continuing operations, basic (usd per share) | $ 1.03 | $ 0.40 | $ 0.28 | $ 0.11 | $ 0.97 | $ (1.67) | $ 0.07 | $ (0.16) | $ 1.80 | $ (0.79) | $ 0.84
Discontinued operations, basic (usd per share) | 0.01 | (0.17) | (0.05) | (0.24) | (1.15) | (3.12) | (1.08) | (0.08) | (0.40) | (5.43) | (0.46)
Net income (loss) per share - basic | 1.04 | 0.23 | 0.23 | (0.13) | (0.18) | (4.79) | (1.01) | (0.24) | 1.40 | (6.22) | 0.38
Net income (loss) per share -- diluted |  |  |  |  |  |  |  |  |  |  |
Continuing operations, diluted (usd per share) | 1.02 | 0.40 | 0.28 | 0.09 | 0.79 | (1.67) | 0.06 | (0.16) | 1.78 | (0.79) | 0.83
Discontinued operations, diluted (usd per share) | 0.01 | (0.17) | (0.05) | (0.19) | (0.93) | (3.12) | (0.87) | (0.08) | (0.40) | (5.43) | (0.45)
Net income (loss) per share - diluted | $ 1.03 | $ 0.23 | $ 0.23 | $ (0.10) | $ (0.14) | $ (4.79) | $ (0.81) | $ (0.24) | $ 1.38 | $ (6.22) | $ 0.38
Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of oil and gas properties | $ 3,874 | $ 7,627 | $ 48,826 | $ 0 | $ 315 | $ 0 | $ 225 | $ 504 |  |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of oil and gas properties | $ 0 | $ 0 | $ 612 | $ 0 | $ 37,646 | $ 81,240 | $ 45,938 | $ 7 |  |  |

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