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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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-Publisher FASB
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-Topic 350
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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