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Marketable Securities - Schedule of Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Schedule Of Available For Sale And Trading Securities [Line Items] |  |
Fair Value | $ 95,998 | $ 43,227
Cost | 114,784 | 55,037
Unrealized Loss | (3,379) | (891)
Unrealized Gain | 6,194 | 4,129
Fair Value | 117,599 | 58,275
Sponsored mutual funds and variable insurance funds [Member] |  |
Schedule Of Available For Sale And Trading Securities [Line Items] |  |
Cost | 11,845 | 7,312
Unrealized Loss | (685) | (689)
Unrealized Gain | 2,653 | 1,390
Fair Value | 13,813 | 8,013
Debt securities [Member] |  |
Schedule Of Available For Sale And Trading Securities [Line Items] |  |
Cost | 29,598 | 24,830
Unrealized Loss | (2,154) | (21)
Unrealized Gain | 165 | 1,003
Fair Value | 27,609 | 25,812
Equity securities [Member] |  |
Schedule Of Available For Sale And Trading Securities [Line Items] |  |
Cost | 3,898 | 3,739
Unrealized Gain | 1,206 | 640
Fair Value | 5,104 | 4,379
Cost | 66,679 | 16,537
Unrealized Loss | (415) | (144)
Unrealized Gain | 2,125 | 1,022
Fair Value | 68,389 | 17,415
Sponsored closed-end funds [Member] |  |
Schedule Of Available For Sale And Trading Securities [Line Items] |  |
Cost | 2,764 | 2,619
Unrealized Loss | (125) | (37)
Unrealized Gain | 45 | 74
Fair Value | $ 2,684 | $ 2,656

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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