Investment Securities (Details 2) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Continuous unrealized loss position, Fair Value
Fair value of available for sale securities with fair values below carrying values for less than 12 months	$ 59,802	$ 810
Fair value of available for sale securities with fair values below carrying values for 12 months or longer	2,833	2,857
Total temporarily impaired securities	62,635	3,667
Continuous unrealized loss position, Gross
Unrealized losses on available for sale securities with fair values below carrying values for less than 12 months	(7,820)	(10)
Unrealized losses on available for sale securities with fair values below carrying values for 12 months or longer	(56)	(212)
Total Unrealized losses on temporarily impaired securities	(7,876)	(222)
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading
Total fair value of trading securities	32,267	98,836
Mortgage-Backed Securities and Bonds
Amortized Cost
Amortized cost of available for sale debt securities that mature within one year	14,845
Amortized cost of available for sale debt securities that mature after one year but within 10 years	29,777
Amortized cost of available for sale debt securities that mature after 10 years	1,001
Total amortized cost of available for sale debt securities	45,623
Fair value
Fair value of available for sale debt securities that mature within one year	14,684
Fair value of available for sale debt securities that mature after one year but within 10 years	29,718
Fair value of available for sale debt securities that mature after 10 years	976
Total fair value of available for sale debt securities	45,378
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading
Fair value of trading securities that mature after one year but within 10 years	13,424
Fair value of trading securities that mature after 10 years	64
Total fair value of trading securities	13,488
Municipal bonds
Continuous unrealized loss position, Fair Value
Fair value of available for sale securities with fair values below carrying values for 12 months or longer	2,511	2,544
Total temporarily impaired securities	2,511	2,544
Continuous unrealized loss position, Gross
Unrealized losses on available for sale securities with fair values below carrying values for 12 months or longer	(38)	(185)
Total Unrealized losses on temporarily impaired securities	(38)	(185)
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading
Total fair value of trading securities	500	487
Corporate bonds
Continuous unrealized loss position, Fair Value
Fair value of available for sale securities with fair values below carrying values for less than 12 months	24,378
Total temporarily impaired securities	24,378
Continuous unrealized loss position, Gross
Unrealized losses on available for sale securities with fair values below carrying values for less than 12 months	(232)
Total Unrealized losses on temporarily impaired securities	(232)
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading
Total fair value of trading securities	12,924	50
Mutual funds
Continuous unrealized loss position, Fair Value
Fair value of available for sale securities with fair values below carrying values for less than 12 months	35,424	810
Fair value of available for sale securities with fair values below carrying values for 12 months or longer	322	313
Total temporarily impaired securities	35,746	1,123
Continuous unrealized loss position, Gross
Unrealized losses on available for sale securities with fair values below carrying values for less than 12 months	(7,588)	(10)
Unrealized losses on available for sale securities with fair values below carrying values for 12 months or longer	(18)	(27)
Total Unrealized losses on temporarily impaired securities	(7,606)	(37)
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading
Total fair value of trading securities	$ 18,744	$ 32,070

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Namespace Prefix:	wdr
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Balance Type:	debit
Period Type:	instant

- Definition

Represents the fair value of debt securities which are expected to mature after ten years from the balance sheet date and which are categorized as trading securities.

+ Details

Name:	wdr_TradingSecuritiesDebtMaturitiesAfterTenYearsFairValue
Namespace Prefix:	wdr
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant