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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
	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%

X

- Details

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

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