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Goodwill and Other Intangible Assets - Summary of Other Intangible Assets and Related Accumulated Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	$ 382,312	$ 377,086
Accumulated amortization	(145,868)	(109,827)
Total intangibles, net	236,444	267,259
Customer related intangibles
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	187,717	186,231
Accumulated amortization	(64,375)	(51,491)
Acquired software
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	179,466	176,096
Accumulated amortization	(76,800)	(55,115)
Trade names
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	11,435	11,065
Accumulated amortization	(3,768)	(2,740)
Leases acquired
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	3,694	3,694
Accumulated amortization	$ (925)	$ (481)

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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-Publisher FASB
-Name Accounting Standards Codification
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