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Investment in Unconsolidated Affiliates - Summary of Activity in Income from Unconsolidated Affiliates (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity Method Investments And Joint Ventures [Abstract]
(Loss) income from unconsolidated affiliates	$ (161)	$ (430)	$ 112
Elimination of intercompany revenue	1,804	1,634	1,685
Income from unconsolidated affiliates	$ 1,643	$ 1,204	$ 1,797

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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