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Investments - Schedule of Investment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Investment [Line Items]
Investments, at fair value	$ 4,526	$ 4,168
Investments in equity securities [Member]
Investment [Line Items]
Investments, at fair value	2,215	2,013
Rabbi trust (associated with certain director's compensation) [Member]
Investment [Line Items]
Investments, at fair value	41	39
Rabbi trust (associated with Supplemental Executive Retirement Savings Plan) [Member]
Investment [Line Items]
Investments, at fair value	$ 2,270	$ 2,116

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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