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Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 645,434 | $ 598,686
Accumulated Amortization | (364,023) | (335,507)
Intangible Assets, Net | $ 281,411 | 263,179
Remaining Weighted Average Amortization Period in Years | 8 years 3 months 18 days |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 648,434 | 598,686
Accumulated Amortization | (364,023) | (335,507)
Intangible Assets, Net | 284,411 | 263,179
Engineering license |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible Assets | 3,000 | 0
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | 354,579 | 327,334
Accumulated Amortization | (158,622) | (137,333)
Intangible Assets, Net | $ 195,957 | 190,001
Remaining Weighted Average Amortization Period in Years | 6 years 4 months 24 days |
Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (158,622) | (137,333)
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | 137,238 | 136,266
Accumulated Amortization | (135,657) | (135,847)
Intangible Assets, Net | $ 1,581 | 419
Remaining Weighted Average Amortization Period in Years | 24 days |
Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (135,657) | (135,847)
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | 81,834 | 74,797
Accumulated Amortization | (20,591) | (17,057)
Intangible Assets, Net | $ 61,243 | 57,740
Remaining Weighted Average Amortization Period in Years | 15 years 7 months 6 days |
Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (20,591) | (17,057)
Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | 40,267 | 37,760
Accumulated Amortization | (29,691) | (27,659)
Intangible Assets, Net | $ 10,576 | 10,101
Remaining Weighted Average Amortization Period in Years | 3 years 8 months 12 days |
Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (29,691) | (27,659)
Patented rights and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | 22,516 | 22,529
Accumulated Amortization | (18,838) | (17,611)
Intangible Assets, Net | $ 3,678 | 4,918
Remaining Weighted Average Amortization Period in Years | 2 years 10 months 24 days |
Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (18,838) | (17,611)
Curriculum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | 9,000 | 0
Accumulated Amortization | (624) | 0
Intangible Assets, Net | $ 8,376 | 0
Remaining Weighted Average Amortization Period in Years | 9 years 3 months 18 days |
Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (624) | $ 0

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