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Goodwill and Other Intangible Assets - Summary of Allocation of Acquisition Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 657,987 | $ 650,237 | $ 653,666
Amortizable intangibles, Gross carrying amount | 382,312 | 377,086 |
Amortizable intangibles, Accumulated Amortization | 145,868 | 109,827 |
Customer related intangibles |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortizable intangibles, Gross carrying amount | $ 187,717 | $ 186,231 |
Amortizable intangibles, Weighted Average Amortization Period | 15 years | 15 years |
Amortizable intangibles, Accumulated Amortization | $ 64,375 | $ 51,491 |
Acquired software |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortizable intangibles, Gross carrying amount | $ 179,466 | $ 176,096 |
Amortizable intangibles, Weighted Average Amortization Period | 7 years | 7 years |
Amortizable intangibles, Accumulated Amortization | $ 76,800 | $ 55,115 |
Trade name |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortizable intangibles, Gross carrying amount | $ 11,435 | $ 11,065 |
Amortizable intangibles, Weighted Average Amortization Period | 11 years | 12 years |
Amortizable intangibles, Accumulated Amortization | $ 3,768 | $ 2,740 |
Leases acquired |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortizable intangibles, Gross carrying amount | $ 3,694 | $ 3,694 |
Amortizable intangibles, Weighted Average Amortization Period | 10 years | 9 years |
Amortizable intangibles, Accumulated Amortization | $ 925 | $ 481 |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- 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 + Details
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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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