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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
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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)

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