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Business Segment, Geographic Area, Product and Significant Customer Information - Customers With Net Revenues Greater Than 10% of Total Net Revenues (Detail) | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Customer A [Member] |  |
Revenue, Major Customer [Line Items] |  |
Percentage of total net revenues | 14.70% | 14.90%
Customer B [Member] |  |
Revenue, Major Customer [Line Items] |  |
Percentage of total net revenues | 9.60% | 10.80%

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- Details
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration