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Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 203,138 | $ 239,790 | $ 235,498 | $ 269,998 | $ 199,023 | $ 224,249 | $ 232,641 | $ 266,090 | $ 948,424 | $ 922,003 | $ 855,340
Operating expenses | 200,706 | 209,146 | 198,148 | 215,496 | 181,824 | 198,607 | 205,102 | 204,750 | 823,496 | 790,283 | 755,584
Gross margin | 2,432 | 30,644 | 37,350 | 54,502 | 17,199 | 25,642 | 27,539 | 61,340 | 124,928 | 131,720 | 99,756
Corporate general and administrative expenses | 10,490 | 11,670 | 10,566 | 11,680 | 8,873 | 10,279 | 9,993 | 10,028 | 44,406 | 39,173 | 33,295
Operating income | (8,058) | 18,974 | 26,784 | 42,822 | 8,326 | 15,363 | 17,546 | 51,312 | 80,522 | 92,547 | 66,461
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Interest expense | (1,256) | (1,521) | (1,587) | (1,401) | (1,434) | (1,614) | (1,817) | (1,780) | (5,765) | (6,645) | (6,675)
Gain on sale of operations, net | 15 | (145) | 50 | 497 | 362 |  |  | 663 | 417 | 1,025 | 45
Other (expense) income, net | 4,999 | 6,767 | (3,311) | 9,260 | (9,631) | 3,143 | 630 | (1,229) | 17,715 | (7,087) | 14,489
Total other income (expense), net | 3,758 | 5,101 | (4,848) | 8,356 | (10,703) | 1,529 | (1,187) | (2,346) | 12,367 | (12,707) | 7,859
Income from continuing operations before income tax expense | (4,300) | 24,075 | 21,936 | 51,178 | (2,377) | 16,892 | 16,359 | 48,966 | 92,889 | 79,840 | 74,320
Income tax expense (benefit) | (3,164) | 6,069 | 5,322 | 13,613 | (1,424) | 3,297 | 3,238 | 13,156 | 21,840 | 18,267 | 23,288
Income from continuing operations | (1,136) | 18,006 | 16,614 | 37,565 | (953) | 13,595 | 13,121 | 35,810 | 71,049 | 61,573 | 51,032
Gain (loss) from operations of discontinued operations, net of tax | (17) | (200) | (22) | (96) | (20) | (9) | (15) | 41 | (335) | (3) | (655)
Net income | $ (1,153) | $ 17,806 | $ 16,592 | $ 37,469 | $ (973) | $ 13,586 | $ 13,106 | $ 35,851 | $ 70,714 | $ 61,570 | $ 50,377
Basic: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ (0.02) | $ 0.33 | $ 0.31 | $ 0.69 | $ (0.02) | $ 0.25 | $ 0.24 | $ 0.66 | $ 1.31 | $ 1.13 | $ 0.95
Discontinued operations |  |  |  |  |  |  |  |  | (0.01) |  | (0.01)
Net income | (0.02) | 0.33 | 0.31 | 0.69 | (0.02) | 0.25 | 0.24 | 0.66 | 1.30 | 1.13 | 0.94
Diluted: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | (0.02) | 0.32 | 0.30 | 0.67 | (0.02) | 0.24 | 0.23 | 0.64 | 1.27 | 1.09 | 0.92
Discontinued operations |  |  |  |  |  |  |  |  | (0.01) |  | (0.01)
Net income | $ (0.02) | $ 0.32 | $ 0.30 | $ 0.67 | $ (0.02) | $ 0.24 | $ 0.23 | $ 0.64 | $ 1.26 | $ 1.09 | $ 0.91
Basic weighted average common shares | 54,547 | 54,268 | 54,090 | 54,287 | 54,775 | 54,794 | 54,594 | 54,071 | 54,299 | 54,561 | 53,862
Diluted weighted average common shares | 54,547 | 55,816 | 55,495 | 55,915 | 54,775 | 56,740 | 56,437 | 55,924 | 55,895 | 56,487 | 55,689

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