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Financial instruments - Investments in Company-Sponsored Funds (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Investment Holdings [Line Items]
Fair Value	$ 11,919
Unfunded Commitments	927
Hedge funds [Member]
Investment Holdings [Line Items]
Fair Value	623
Unfunded Commitments
Redemption Frequency	Quarterly - Annually
Redemption Notice Period, Minimum	30 days
Redemption Notice Period, Maximum	120 days
Private equity funds [Member]
Investment Holdings [Line Items]
Fair Value	3,771
Unfunded Commitments	927
Distressed opportunities investment trust [Member]
Investment Holdings [Line Items]
Fair Value	7,525
Unfunded Commitments

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 investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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