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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information | The following table summarizes the unaudited quarterly results of operations for 2017 and 2016 (amounts in thousands, except per share data):
| 2017 Quarters Ended (unaudited) |  |
| March 31 |  | June 30 |  | September 30 |  | December 31 |  | Total
Revenues | $ | 153,416 |  |  | $ | 246,412 |  |  | $ | 304,219 |  |  | $ | 253,911 |  |  | $ | 957,958 |
Gross profit | 9,287 |  |  | 25,205 |  |  | 30,631 |  |  | 23,969 |  |  | 89,092 |
Income (loss) before income taxes and earnings attributable to noncontrolling interests | (1,859 | ) |  | 4,661 |  |  | 9,170 |  |  | 3,963 |  |  | 15,935 |
Net income (loss) attributable to Sterling common stockholders | (2,257 | ) |  | 3,662 |  |  | 7,132 |  |  | 3,080 |  |  | 11,617 |
Net income (loss) per share attributable to Sterling common stockholders: |  |  |  |  |  |  |  |  |
Basic | $ | (0.09 | ) |  | $ | 0.14 |  |  | $ | 0.27 |  |  | $ | 0.11 |  |  | $ | 0.44 |
Diluted | $ | (0.09 | ) |  | $ | 0.13 |  |  | $ | 0.26 |  |  | $ | 0.11 |  |  | $ | 0.43 |
| 2016 Quarters Ended (unaudited) |  |
| March 31 |  | June 30 |  | September 30 |  | December 31 |  | Total
Revenues | $ | 126,567 |  |  | $ | 189,582 |  |  | $ | 205,629 |  |  | $ | 168,345 |  |  | $ | 690,123 |
Gross profit | 3,548 |  |  | 15,543 |  |  | 16,622 |  |  | 6,345 |  |  | 42,058 |
Income (loss) before income taxes and earnings attributable to noncontrolling interests | (7,336 | ) |  | 2,570 |  |  | 3,196 |  |  | (5,754 | ) |  | (7,324 | )
Net income (loss) attributable to Sterling common stockholders | (7,328 | ) |  | 2,023 |  |  | 2,415 |  |  | (6,348 | ) |  | (9,238 | )
Net income (loss) per share attributable to Sterling common stockholders: |  |  |  |  |  |  |  |  |
Basic and diluted | $ | (0.37 | ) |  | $ | 0.09 |  |  | $ | 0.10 |  |  | $ | (0.25 | ) |  | $ | (0.40 | )

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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