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Carrying Amount of Finite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 290,061	$ 270,296
Accumulated Amortization	241,232	211,684
Capitalized software costs
Finite-Lived Intangible Assets
Gross Carrying Amount	133,255	126,737
Accumulated Amortization	114,806	101,316
Website development costs
Finite-Lived Intangible Assets
Gross Carrying Amount	132,927	119,971
Accumulated Amortization	103,295	87,736
Trademarks
Finite-Lived Intangible Assets
Gross Carrying Amount	11,220	11,092
Accumulated Amortization	10,792	10,647
Other
Finite-Lived Intangible Assets
Gross Carrying Amount	8,066	7,945
Accumulated Amortization	7,746	7,434
Trademarks and other intangible assets
Finite-Lived Intangible Assets
Gross Carrying Amount	285,468	265,745
Accumulated Amortization	236,639	207,133
Franchise Rights
Finite-Lived Intangible Assets
Gross Carrying Amount	4,593	4,551
Accumulated Amortization	$ 4,593	$ 4,551

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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- 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

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- Definition

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+ References

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