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Goodwill and Other Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, Unamortizable intangible assets | $ 163,553 | $ 176,255
Gross Carrying Amount, Amortizable intangible assets | 2,236,297 | 2,006,457
Gross Carrying Amount, Total intangible assets | 2,399,850 | 2,182,712
Accumulated Amortization, Amortizable intangible assets | (1,000,738) | (771,673)
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, Amortizable intangible assets | 802,597 | 761,290
Accumulated Amortization, Amortizable intangible assets | (355,642) | (270,447)
Mortgage servicing rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, Amortizable intangible assets | 608,757 | 501,087
Accumulated Amortization, Amortizable intangible assets | (235,626) | (180,563)
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, Amortizable intangible assets | 321,406 | 306,559
Accumulated Amortization, Amortizable intangible assets | (64,866) | (46,837)
Management contracts [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, Unamortizable intangible assets | 90,503 | 101,355
Gross Carrying Amount, Amortizable intangible assets | 203,291 | 177,014
Accumulated Amortization, Amortizable intangible assets | (122,450) | (99,733)
Non-compete agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, Amortizable intangible assets | 73,750 | 73,750
Accumulated Amortization, Amortizable intangible assets | (57,358) | (32,777)
Other amortizable intangible assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, Amortizable intangible assets | 226,496 | 186,757
Accumulated Amortization, Amortizable intangible assets | (164,796) | (141,316)
Trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, Unamortizable intangible assets | 56,800 | 56,800
Trade names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, Unamortizable intangible assets | $ 16,250 | $ 18,100

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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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