Noncontrolling Interest	12 Months Ended
Noncontrolling Interest	Dec. 31, 2012
Noncontrolling Interest [Abstract]
Noncontrolling Interest	NONCONTROLLING INTEREST In March 2012, the Company entered into an agreement with Mitsubishi Corporation (Mitsubishi) in which a Mitsubishi subsidiary acquired a 25% interest in the Company's previously wholly-owned subsidiary, Stillwater Canada Inc (SCI), which owns the Marathon PGM-copper project and related properties, for approximately US$81.25 million in cash and contributed an additional $13.6 million to satisfy Mitsubishi's portion of the venture's initial cash call. Mitsubishi will be responsible for funding its 25% share of operating, capital and exploration expenditures on the Marathon properties and has agreed to cooperate and support efforts to secure project financing for Marathon. Mitsubishi will have an option to purchase up to 100% of Marathon's future PGM production under a related supply agreement at a relatively small discount to market. The transaction closed on April 10, 2012. The Company incurred transaction costs of approximately $1.1 million related to the agreement with Mitsubishi, which were recorded within Stockholders' Equity on the Company's Consolidated Balance Sheets. The noncontrolling interests' share of equity in SCI is reflected as Noncontrolling interest in the Company's Consolidated Balance Sheets and was $51.8 million as of December 31, 2012. The change in the parent company's equity as a result of the sale of the noncontrolling interest in SCI was an increase to Additional paid in capital of $42.5 million, offset by expenses incurred of $1.1 million.

The entire disclosure for noncontrolling interest in consolidated subsidiaries, which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the location of this amount on the balance sheet (when not reported separately), an explanation of the increase or decrease in the amount of the noncontrolling interest, the noncontrolling interest share of the net Income or Loss of the subsidiary, the location of this amount on the income statement (when not reported separately), the nature of the noncontrolling interest such as background information and terms, the amount of the noncontrolling interest represented by preferred stock, a description of the preferred stock, and the dividend requirements of the preferred stock.

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