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Goodwill and Other Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
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

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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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)
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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