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Revenues Based on Location of Legal Entity (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 442,204	$ 455,470	$ 449,137	$ 432,338	$ 425,158	$ 451,178	$ 454,324	$ 425,552	$ 1,779,149	$ 1,756,212	$ 1,652,432
UNITED STATES
Segment Reporting Information [Line Items]
Revenues									1,281,444	1,256,046	1,208,978
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues									232,281	232,281	194,614
All Other Foreign Countries
Segment Reporting Information [Line Items]
Revenues									$ 265,424	$ 267,885	$ 248,840

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ 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=26872669&loc=d3e20235-122688

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+ References

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