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Concentration of Major Suppliers - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2012 Vendor	Jun. 30, 2011 Vendor	Jun. 30, 2012 Vendor	Jun. 30, 2011 Vendor
Concentration Risk [Line Items]
Number of major suppliers	2	2	2	2
Supplier A
Concentration Risk [Line Items]
Percentage of total purchase from major suppliers	79.00%	74.00%	76.00%	77.00%
Supplier B
Concentration Risk [Line Items]
Percentage of total purchase from major suppliers	6.00%	16.00%	10.00%	12.00%

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- Definition

Number of Suppliers

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X

- Definition

Percentage of Purchases from Major Suppliers

+ References

No definition available.

+ Details

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- Details

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