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Selected Segment Financial Data, Revenues and Long lived Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Revenues
Revenues	$ 240,599	$ 219,930	$ 472,061	$ 445,996
Long lived assets
Long lived assets	1,400,983		1,400,983		$ 1,416,825
United States [Member]
Revenues
Revenues	130,576	125,550	265,578	258,915
Long lived assets
Long lived assets	777,902		777,902		752,442
United Kingdom [Member]
Long lived assets
Long lived assets	203,509		203,509		204,193
Other [Member]
Revenues
Revenues	110,023	$ 94,380	206,483	$ 187,081
Long lived assets
Long lived assets	$ 419,572		$ 419,572		$ 460,190

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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