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Investments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
Investments - Additional Information (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 ELX [Member]	Mar. 28, 2012 ELX [Member]
Investment [Line Items]
Share in losses related to equity method investments	$ (2,705,000)	$ (2,995,000)	$ (7,217,000)	$ (8,103,000)
Credit agreement commitment to variable interest entity					$ 16,000,000	$ 16,000,000

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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