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Investments in Unconsolidated Affiliates - Summary of Activity in Income from Unconsolidated Affiliates (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Income (loss) from unconsolidated affiliates	$ 902	$ (575)
Elimination of intercompany revenue	446	490
Income (loss) from unconsolidated affiliates	$ 1,348	$ (85)

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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