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Segment Information (Narrative) (Detail)	6 Months Ended
Segment Information (Narrative) (Detail)	Jun. 30, 2012
Segment Information [Line Items]
Concentration Risk, Customer	No single customer accounted for 10% or greater of the Company's revenues for the three and six months ended June 30, 2012 and 2011. No single customer accounted for 10% or greater of the Company's gross accounts receivable as of June 30, 2012 and December 31, 2011.

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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