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Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended			12 Months Ended
	Jul. 31, 2010 Patents	Dec. 31, 2009 Respondent	Sep. 30, 2009 Respondent	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases [Abstract]
Purchase order outstanding				$ 3,470,000
Total annual rental expense				5,772,000	5,806,000	5,557,000
Operating lease expiration year				2021
Total annual rental income				$ 676,000	$ 854,000	$ 791,000
Number of respondents with whom settlement reached		5	2
Number of the company's patents found invalid	2

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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