Fair Value Disclosures - Additional Information (Detail) (USD $)	Mar. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of financial assets derived from Level 1 inputs measured at fair value	58.00%
Percentage of financial assets derived from Level 2 inputs measured at fair value	41.00%
Percentage of financial assets derived from Level 3 inputs measured at fair value	1.00%
Significant Unobservable Inputs (Level 3) [Member] \| Venture capital investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unfunded commitment related to investment	62,500
Significant Unobservable Inputs (Level 3) [Member] \| Venture capital investments [Member] \| Medical and medical technology sectors [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities, at fair value	162,841
Significant Other Inputs (Level 2) [Member] \| Offshore fund [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities, at fair value	907,000
Available-for-sale securities, at fair value	4,914,000

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References+ Details

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

+ References+ Details