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Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 654,854 | $ 637,570
Accumulated amortization | (394,110) | (357,609)
Net carrying amount | 260,744 | 279,961
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 343,276 | 344,175
Accumulated amortization | (188,027) | (168,134)
Net carrying amount | $ 155,249 | $ 176,041
Customer relationships | Minimum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life in years | 8 years | 8 years
Customer relationships | Maximum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life in years | 14 years | 14 years
Trademark |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 41,671 | $ 41,594
Accumulated amortization | (27,996) | (25,241)
Net carrying amount | $ 13,675 | $ 16,353
Trademark | Minimum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life in years | 2 years | 2 years
Trademark | Maximum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life in years | 15 years | 15 years
Software packages |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 213,368 | $ 195,262
Accumulated amortization | (147,933) | (136,907)
Net carrying amount | $ 65,435 | $ 58,355
Software packages | Minimum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life in years | 3 years | 3 years
Software packages | Maximum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life in years | 10 years | 10 years
Non-compete agreement |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life in years | 15 years | 15 years
Gross amount | $ 56,539 | $ 56,539
Accumulated amortization | (30,154) | (27,327)
Net carrying amount | $ 26,385 | $ 29,212

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