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Basis of Presentation and Significant Accounting Policies - Summary of Impact of Adopting New Accounting Standards on Consolidated Financial Statements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
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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 | Jan. 01, 2018 | Dec. 31, 2015
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | $ 207,287 |  |  |  | $ 188,300 |  |  |  | $ 207,287 | $ 188,300 |  |  |
Other current assets | 216,251 |  |  |  | 259,873 |  |  |  | 216,251 | 259,873 |  |  |
Other non-current assets | 759,493 |  |  |  | 728,058 |  |  |  | 759,493 | 728,058 |  |  |
Total assets | 1,183,031 |  |  |  | 1,176,231 |  |  |  | 1,183,031 | 1,176,231 |  |  |
Accounts payable | 58,630 |  |  |  | 51,375 |  |  |  | 58,630 | 51,375 |  |  |
Accrued personnel costs | 63,953 |  |  |  | 45,264 |  |  |  | 63,953 | 45,264 |  |  |
Other current liabilities | 198,731 |  |  |  | 237,607 |  |  |  | 198,731 | 237,607 |  |  |
Deferred income taxes, net | 6,764 |  |  |  | 3,339 |  |  |  | 6,764 | 3,339 |  |  |
Other non-current liabilities | 261,290 |  |  |  | 307,767 |  |  |  | 261,290 | 307,767 |  |  |
Total liabilities | 589,368 |  |  |  | 645,352 |  |  |  | 589,368 | 645,352 |  |  |
Retained earnings | 408,963 |  |  |  | 345,302 |  |  |  | 408,963 | 345,302 |  |  |
Other stockholders' equity | 184,700 |  |  |  | 185,577 |  |  |  | 184,700 | 185,577 |  |  |
Total stockholders’ equity | 593,663 |  |  |  | 530,879 |  |  |  | 593,663 | 530,879 | $ 480,021 |  | $ 427,948
Total liabilities and stockholders’ equity | 1,183,031 |  |  |  | 1,176,231 |  |  |  | 1,183,031 | 1,176,231 |  |  |
Revenue |  |  |  |  |  |  |  |  | 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, 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 | (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 |  |
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 |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | (973) | $ 13,586 | $ 13,106 | 35,851 | 4,847 | $ 9,658 | $ 10,998 | 24,874 | 61,570 | 50,377 | 40,065 |  |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  | 38,713 |  |  |  |
Changes in assets and liabilities, net of acquisitions and divestitures: |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  |  | (10,668) | (13,849) | (19,188) |  |
Other assets |  |  |  |  |  |  |  |  | (3,344) | 3,180 | (5,612) |  |
Accounts payable |  |  |  |  |  |  |  |  | 974 | 3,738 | 10,217 |  |
Accrued personnel costs |  |  |  |  |  |  |  |  | 17,901 | (599) | 5,496 |  |
Other liabilities |  |  |  |  |  |  |  |  | (140) | 3,508 | 5,965 |  |
Other |  |  |  |  |  |  |  |  | 426 |  |  |  |
Net cash provided by continuing operations |  |  |  |  |  |  |  |  | 105,432 | 77,663 | 73,674 |  |
Operating cash flows used in discontinued operations |  |  |  |  |  |  |  |  | (184) | (627) | 387 |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 105,248 | 77,036 | 74,061 |  |
Net provided by investing activities |  |  |  |  |  |  |  |  | (47,576) | (48,681) | (9,847) |  |
Net cash used in financing activities |  |  |  |  |  |  |  |  | (109,380) | (45,593) | (18,384) |  |
Net increase in cash, cash equivalents and restricted cash |  |  |  |  |  |  |  |  | (51,708) |  |  |  |
Cash, cash equivalents and restricted cash at beginning of year |  |  |  | 182,262 |  |  |  | $ 199,500 | 182,262 | 199,500 | 153,670 |  |
Cash, cash equivalents and restricted cash at end of year | 130,554 |  |  |  | 182,262 |  |  |  | 130,554 | 182,262 | $ 199,500 |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  |  |  |  |  | $ 198,398 |
Other current assets |  |  |  |  |  |  |  |  |  |  |  | 259,953 |
Other non-current assets |  |  |  |  |  |  |  |  |  |  |  | 728,786 |
Total assets |  |  |  |  |  |  |  |  |  |  |  | 1,187,137 |
Accounts payable |  |  |  |  |  |  |  |  |  |  |  | 57,656 |
Accrued personnel costs |  |  |  |  |  |  |  |  |  |  |  | 45,859 |
Other current liabilities |  |  |  |  |  |  |  |  |  |  |  | 237,720 |
Deferred income taxes, net |  |  |  |  |  |  |  |  |  |  |  | 4,153 |
Other non-current liabilities |  |  |  |  |  |  |  |  |  |  |  | 308,779 |
Total liabilities |  |  |  |  |  |  |  |  |  |  |  | 654,167 |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | 347,393 |
Other stockholders' equity |  |  |  |  |  |  |  |  |  |  |  | 185,577 |
Total stockholders’ equity |  |  |  |  |  |  |  |  |  |  |  | 532,970 |
Total liabilities and stockholders’ equity |  |  |  |  |  |  |  |  |  |  |  | 1,187,137 |
Accounting Standards Update 2014-09 [Member] | Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | (12,671) |  |  |  |  |  |  |  | (12,671) |  |  | 10,098 |
Other current assets | (80) |  |  |  |  |  |  |  | (80) |  |  | 80 |
Other non-current assets | (647) |  |  |  |  |  |  |  | (647) |  |  | 728 |
Total assets | (13,398) |  |  |  |  |  |  |  | (13,398) |  |  | 10,906 |
Accounts payable | (7,930) |  |  |  |  |  |  |  | (7,930) |  |  | 6,281 |
Accrued personnel costs | (587) |  |  |  |  |  |  |  | (587) |  |  | 595 |
Other current liabilities | (113) |  |  |  |  |  |  |  | (113) |  |  | 113 |
Deferred income taxes, net | (1,035) |  |  |  |  |  |  |  | (1,035) |  |  | 814 |
Other non-current liabilities | (897) |  |  |  |  |  |  |  | (897) |  |  | 1,012 |
Total liabilities | (10,562) |  |  |  |  |  |  |  | (10,562) |  |  | 8,815 |
Retained earnings | (2,836) |  |  |  |  |  |  |  | (2,836) |  |  | 2,091 |
Total stockholders’ equity | (2,836) |  |  |  |  |  |  |  | (2,836) |  |  | 2,091 |
Total liabilities and stockholders’ equity | (13,398) |  |  |  |  |  |  |  | (13,398) |  |  | $ 10,906 |
Revenue |  |  |  |  |  |  |  |  | (1,039) |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | (73) |  |  |  |
Gross margin |  |  |  |  |  |  |  |  | (966) |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (966) |  |  |  |
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | (966) |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  | (221) |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (745) |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (745) |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | (745) |  |  |  |
Changes in assets and liabilities, net of acquisitions and divestitures: |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  |  | 2,573 |  |  |  |
Other assets |  |  |  |  |  |  |  |  | (81) |  |  |  |
Accounts payable |  |  |  |  |  |  |  |  | (1,649) |  |  |  |
Accrued personnel costs |  |  |  |  |  |  |  |  | 8 |  |  |  |
Other liabilities |  |  |  |  |  |  |  |  | (106) |  |  |  |
Accounting Standards Update 2014-09 [Member] | Balances without Adoption of Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 194,616 |  |  |  |  |  |  |  | 194,616 |  |  |  |
Other current assets | 216,171 |  |  |  |  |  |  |  | 216,171 |  |  |  |
Other non-current assets | 758,846 |  |  |  |  |  |  |  | 758,846 |  |  |  |
Total assets | 1,169,633 |  |  |  |  |  |  |  | 1,169,633 |  |  |  |
Accounts payable | 50,700 |  |  |  |  |  |  |  | 50,700 |  |  |  |
Accrued personnel costs | 63,366 |  |  |  |  |  |  |  | 63,366 |  |  |  |
Other current liabilities | 198,618 |  |  |  |  |  |  |  | 198,618 |  |  |  |
Deferred income taxes, net | 5,729 |  |  |  |  |  |  |  | 5,729 |  |  |  |
Other non-current liabilities | 260,393 |  |  |  |  |  |  |  | 260,393 |  |  |  |
Total liabilities | 578,806 |  |  |  |  |  |  |  | 578,806 |  |  |  |
Retained earnings | 406,127 |  |  |  |  |  |  |  | 406,127 |  |  |  |
Other stockholders' equity | 184,700 |  |  |  |  |  |  |  | 184,700 |  |  |  |
Total stockholders’ equity | 590,827 |  |  |  |  |  |  |  | 590,827 |  |  |  |
Total liabilities and stockholders’ equity | 1,169,633 |  |  |  |  |  |  |  | 1,169,633 |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 920,964 |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 790,210 |  |  |  |
Gross margin |  |  |  |  |  |  |  |  | 130,754 |  |  |  |
Corporate general and administrative expenses |  |  |  |  |  |  |  |  | 39,173 |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 91,581 |  |  |  |
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (6,645) |  |  |  |
Gain on sale of operations, net |  |  |  |  |  |  |  |  | 1,025 |  |  |  |
Other expense, net |  |  |  |  |  |  |  |  | (7,087) |  |  |  |
Total other (expense) income, net |  |  |  |  |  |  |  |  | (12,707) |  |  |  |
Income from continuing operations before income tax expense |  |  |  |  |  |  |  |  | 78,874 |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  | 18,046 |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 60,828 |  |  |  |
Loss from operations of discontinued operations, net of tax |  |  |  |  |  |  |  |  | (3) |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 60,825 |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 60,825 |  |  |  |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  | 38,713 |  |  |  |
Changes in assets and liabilities, net of acquisitions and divestitures: |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  |  | (8,095) |  |  |  |
Other assets |  |  |  |  |  |  |  |  | (3,425) |  |  |  |
Accounts payable |  |  |  |  |  |  |  |  | (675) |  |  |  |
Accrued personnel costs |  |  |  |  |  |  |  |  | 17,909 |  |  |  |
Other liabilities |  |  |  |  |  |  |  |  | (246) |  |  |  |
Other |  |  |  |  |  |  |  |  | 426 |  |  |  |
Net cash provided by continuing operations |  |  |  |  |  |  |  |  | 105,432 |  |  |  |
Operating cash flows used in discontinued operations |  |  |  |  |  |  |  |  | (184) |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 105,248 |  |  |  |
Net provided by investing activities |  |  |  |  |  |  |  |  | (47,576) |  |  |  |
Net cash used in financing activities |  |  |  |  |  |  |  |  | (109,380) |  |  |  |
Net increase in cash, cash equivalents and restricted cash |  |  |  |  |  |  |  |  | (51,708) |  |  |  |
Cash, cash equivalents and restricted cash at beginning of year |  |  |  | $ 182,262 |  |  |  |  | 182,262 |  |  |  |
Cash, cash equivalents and restricted cash at end of year | $ 130,554 |  |  |  | $ 182,262 |  |  |  | $ 130,554 | $ 182,262 |  |  |

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