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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, 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