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Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |||
|---|---|---|---|---|
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Dec. 31, 2013
Segment
Financial_Institution
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Related Party Transaction [Line Items] | ||||
| Cash and cash equivalents maturity period maximum | 90 days | |||
| Number of financial institutions | 1 | |||
| Cash balance in British pounds equivalent to USD, which is subject to exchange rate changes | $ 104,316 | $ 41,246 | $ 25,630 | $ 14,233 |
| Accounts receivable related-party | 14,791 | 8,180 | ||
| ETF advisory fee revenue | 148,594 | 84,024 | 64,366 | |
| Joint venture agreement date | Jan. 01, 2013 | |||
| Marketing fees | 1,368 | 806 | 537 | |
| Number of operating segments | 1 | |||
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Foreign Exchange [Member]
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||||
| Related Party Transaction [Line Items] | ||||
| Cash balance in British pounds equivalent to USD, which is subject to exchange rate changes | $ 8,057 | |||
| X | ||||||||||
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- Definition
For an unclassified balance sheet, amount of receivables arising from transactions with related parties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of fees earned from providing investment advice and research to customers. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Cash and cash equivalents criteria maturity period. No definition available.
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| X | ||||||||||
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- Definition
Joint Venture Date Commenced No definition available.
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| X | ||||||||||
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- Definition
Number of financial institutions. No definition available.
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