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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 199,023 $ 224,249 $ 232,641 $ 266,090 $ 195,142 $ 207,723 $ 211,016 $ 241,459 $ 922,003 $ 855,340 $ 799,832
Operating expenses 181,824 198,607 205,102 204,750 189,975 184,723 188,120 192,766 790,283 755,584 697,726
Gross margin 17,199 25,642 27,539 61,340 5,167 23,000 22,896 48,693 131,720 99,756 102,106
Corporate general and administrative expenses 8,873 10,279 9,993 10,028 7,316 7,979 9,232 8,768 39,173 33,295 36,319
Operating income (loss) 8,326 15,363 17,546 51,312 (2,149) 15,021 13,664 39,925 92,547 66,461 65,787
Other (expense) income:                      
Interest expense (1,434) (1,614) (1,817) (1,780) (1,689) (1,777) (1,692) (1,517) (6,645) (6,675) (6,593)
Gain on sale of operations, net 362     663     23 22 1,025 45 855
Other (expense) income, net (9,631) 3,143 630 (1,229) 5,196 2,792 3,764 2,737 (7,087) 14,489 6,957
Total other (expense) income, net (10,703) 1,529 (1,187) (2,346) 3,507 1,015 2,095 1,242 (12,707) 7,859 1,219
Income from continuing operations before income tax expense (2,377) 16,892 16,359 48,966 1,358 16,036 15,759 41,167 79,840 74,320 67,006
Income tax expense (benefit) (1,424) 3,297 3,238 13,156 (3,368) 6,172 4,343 16,141 18,267 23,288 26,399
Income (loss) from continuing operations (953) 13,595 13,121 35,810 4,726 9,864 11,416 25,026 61,573 51,032 40,607
Gain (loss) from operations of discontinued operations, net of tax (20) (9) (15) 41 121 (206) (418) (152) (3) (655) (542)
Net income (loss) $ (973) $ 13,586 $ 13,106 $ 35,851 $ 4,847 $ 9,658 $ 10,998 $ 24,874 $ 61,570 $ 50,377 $ 40,065
Basic:                      
Continuing operations $ (0.02) $ 0.25 $ 0.24 $ 0.66 $ 0.09 $ 0.18 $ 0.21 $ 0.47 $ 1.13 $ 0.95 $ 0.78
Discontinued operations             (0.01)     (0.01) (0.01)
Net income (0.02) 0.25 0.24 0.66 0.09 0.18 0.20 0.47 1.13 0.94 0.77
Diluted:                      
Continuing operations (0.02) 0.24 0.23 0.64 0.08 0.18 0.20 0.45 1.09 0.92 0.76
Discontinued operations             (0.01)     (0.01) (0.01)
Net income $ (0.02) $ 0.24 $ 0.23 $ 0.64 $ 0.08 $ 0.18 $ 0.19 $ 0.45 $ 1.09 $ 0.91 $ 0.75
Basic weighted average common shares outstanding 54,775 54,794 54,594 54,071 54,034 54,142 53,968 53,293 54,561 53,862 52,321
Diluted weighted average common shares outstanding 56,580 56,740 56,437 55,924 55,822 55,827 55,831 55,214 56,487 55,689 53,513