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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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Equity Method Investments And Joint Ventures [Abstract]
Loss from unconsolidated affiliates			$ (823)	$ (244)
Elimination of intercompany revenue			1,305	1,202
Income from unconsolidated affiliates	$ 1,145	$ 1,950	$ 482	$ 958

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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