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Investments - Summary of Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investments Schedule [Abstract]
Marketable securities	$ 44,248	$ 50,251
Equity method investments	8,964	7,209
Nonqualified retirement plan assets	5,164	5,063
Other investments	925	925
Total investments	$ 59,301	$ 63,448

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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Other investments not otherwise specified in the taxonomy.

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Investments In Nonqualified Retirement Plan Assets

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