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Fair Value Measurements - Additional Information (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total equity method investments	$ 37,905,000	$ 38,191,000
Discovery Offshore
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total equity method investments	37,905,000	38,191,000
Equity method investments, fair value	$ 49,400,000	$ 49,100,000

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 investments accounted for under the equity method of accounting as of the balance sheet date.

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