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Financial Statement Details - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Net unrealized gains (losses)	$ 5,000	$ 24,000
Company's investment portfolio of marketable equity securities			385,000
Company's investment portfolio with a fair value			38,000
Marketable securities other-than-temporary loss	0	38,000	347,000
Property and equipment	70,000	100,000	70,000
Depreciation and amortization expense	$ 7,900,000	$ 9,400,000	$ 11,100,000

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Net amount of accumulated unrealized gains (losses) on investments in available-for-sale securities that are recognized in Accumulated Other Comprehensive Income (AOCI).

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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