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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 753,718 | $ 657,987 | $ 650,237
Amortizable intangibles, Gross carrying amount | 461,234 | 374,384 |
Amortizable intangibles, Accumulated Amortization | 184,382 | 144,767 |
Customer related intangibles |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortizable intangibles, Gross carrying amount | $ 238,219 | $ 179,789 |
Amortizable intangibles, Weighted Average Amortization Period | 15 years | 15 years |
Amortizable intangibles, Accumulated Amortization | $ 78,120 | $ 63,274 |
Acquired software |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortizable intangibles, Gross carrying amount | $ 202,416 | $ 179,466 |
Amortizable intangibles, Weighted Average Amortization Period | 7 years | 7 years |
Amortizable intangibles, Accumulated Amortization | $ 99,772 | $ 76,800 |
Trade name |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortizable intangibles, Gross carrying amount | $ 16,905 | $ 11,435 |
Amortizable intangibles, Weighted Average Amortization Period | 11 years | 11 years |
Amortizable intangibles, Accumulated Amortization | $ 5,139 | $ 3,768 |
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 | 10 years |
Amortizable intangibles, Accumulated Amortization | $ 1,351 | $ 925 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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