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Investment in Equity Securities - Additional Information (Detail) (Andora Energy Corporation)	1 Months Ended
	Nov. 19, 2008	Dec. 31, 2011
Andora Energy Corporation
Business Acquisitions and Investments in Equity Affiliates [Line Items]
Conversion of Signet shares into shares of Andora Energy Corporation	2,241,558
Percentage of equity interest in Andora		3.90%

The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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