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Goodwill and Other Intangible Assets - Summary of Intangible Assets, Net (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Definite-lived intangible assets, net: |  |  |  |
Investment contracts | $ 158,747 us-gaap_FiniteLivedIntangibleAssetsGross | $ 157,882 us-gaap_FiniteLivedIntangibleAssetsGross |  |
Accumulated amortization | (149,380)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (145,665)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  |
Definite-lived intangible assets, net | 9,367 us-gaap_FiniteLivedIntangibleAssetsNet | 12,217 us-gaap_FiniteLivedIntangibleAssetsNet |  |
Indefinite-lived intangible assets | 32,416 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | 32,416 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |  |
Total intangible assets, net | $ 41,783 us-gaap_IntangibleAssetsNetExcludingGoodwill | $ 44,633 us-gaap_IntangibleAssetsNetExcludingGoodwill | $ 48,711 us-gaap_IntangibleAssetsNetExcludingGoodwill | $ 52,096 us-gaap_IntangibleAssetsNetExcludingGoodwill

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- 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=26713463&loc=d3e16323-109275 + Details
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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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after 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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + 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 (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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