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Business Segment, Geographic and Major Customer Information - Major Customers (Details) | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Customer A [Member] |  |  |
Summary of revenue from major costumers |  |  |
Percentage of revenue by major customers | 17.50% |  | 15.80%
Customer B [Member] |  |  |
Summary of revenue from major costumers |  |  |
Percentage of revenue by major customers | 10.00% | [1] | 11.10%
[1] | This customer did not account for more than 10% of revenue.

X
- 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

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