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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
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 164,412 | $ 187,102 | $ 185,042 | $ 213,866 | $ 157,022 | $ 180,269 | $ 177,466 | $ 204,726 | $ 750,422 | $ 719,483 | $ 677,171
Operating expenses | 160,788 | 159,175 | 163,117 | 170,864 | 154,316 | 155,233 | 158,317 | 161,938 | 653,944 | 629,804 | 593,339
Gross margin | 3,624 | 27,927 | 21,925 | 43,002 | 2,706 | 25,036 | 19,149 | 42,788 | 96,478 | 89,679 | 83,832
Corporate general and administrative | 8,071 | 8,043 | 6,615 | 9,865 | 6,790 | 8,889 | 8,306 | 10,198 | 32,594 | 34,183 | 34,398
Operating income (loss) | (4,447) | 19,884 | 15,310 | 33,137 | (4,084) | 16,147 | 10,843 | 32,590 | 63,884 | 55,496 | 49,434
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |
Interest expense | (1,237) | (1,840) | (2,848) | (2,977) | (2,991) | (3,123) | (3,577) | (3,433) | (8,902) | (13,124) | (15,374)
Gain on sale of operations, net | (22) | 5 | 45 | 56 | 1,210 | 17 | 68 | 8 | 84 | 1,303 | 79
Other income (loss), net | 2,706 | (1,673) | (1,126) | 2,859 | 2,350 | (1,368) | 3,936 | 1,975 | 2,766 | 6,893 | 7,817
Total other (expense) income, net | 1,447 | (3,508) | (3,929) | (62) | 569 | (4,474) | 427 | (1,450) | (6,052) | (4,928) | (7,478)
Income (loss) from continuing operations before income tax expense (benefit) | (3,000) | 16,376 | 11,381 | 33,075 | (3,515) | 11,673 | 11,270 | 31,140 | 57,832 | 50,568 | 41,956
Income tax expense (benefit) | (2,226) | 6,787 | 4,696 | 13,572 | (2,137) | 4,353 | 4,824 | 13,114 | 22,829 | 20,154 | 16,577
Income (loss) from continuing operations | (774) | 9,589 | 6,685 | 19,503 | (1,378) | 7,320 | 6,446 | 18,026 | 35,003 | 30,414 | 25,379
(Loss) income from operations of discontinued operations, net of tax | (1,097) | (561) | (330) | (335) | 60 | (239) | (312) | (263) | (2,323) | (754) | 2,148
(Loss) gain on disposal of discontinued operations, net of tax | (35) | 1,172 | 290 |  | (7) | 607 | (27) | (474) | 1,427 | 99 | 58,336
Net income (loss) | $ (1,906) | $ 10,200 | $ 6,645 | $ 19,168 | $ (1,325) | $ 7,688 | $ 6,107 | $ 17,289 | $ 34,107 | $ 29,759 | $ 85,863
Basic: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ (0.02) | $ 0.19 | $ 0.14 | $ 0.41 | $ (0.03) | $ 0.15 | $ 0.13 | $ 0.37 | $ 0.70 | $ 0.63 | $ 0.52
Discontinued operations | (0.02) | 0.01 | (0.01) | (0.01) | 0.00 | 0.01 | 0.00 | (0.01) | (0.01) | (0.01) | 1.25
Net income (loss) | (0.04) | 0.20 | 0.13 | 0.40 | (0.03) | 0.16 | 0.13 | 0.36 | 0.69 | 0.62 | 1.77
Diluted: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | (0.02) | 0.18 | 0.13 | 0.38 | (0.03) | 0.14 | 0.12 | 0.34 | 0.66 | 0.59 | 0.52
Discontinued operations | (0.02) | 0.01 |  | (0.01) | 0.00 | 0.01 | 0.00 | (0.01) | (0.01) | (0.01) | 1.23
Net income (loss) | $ (0.04) | $ 0.19 | $ 0.13 | $ 0.37 | $ (0.03) | $ 0.15 | $ 0.12 | $ 0.33 | $ 0.65 | $ 0.58 | $ 1.75
Basic weighted average common shares | 51,669 | 51,736 | 49,464 | 48,146 | 48,455 | 48,451 | 48,273 | 48,182 | 50,280 | 48,343 | 48,632
Diluted weighted average common shares | 51,669 | 54,445 | 52,024 | 51,385 | 48,455 | 51,209 | 52,052 | 52,618 | 52,693 | 51,487 | 49,141

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