Property and Equipment - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Property, Plant and Equipment [Line Items]
Impairment of property and equipment	$ 4,003,000	$ 4,003,000
Property and equipment remaining balance expected to recover	3,900,000	3,900,000
Depreciation expense, including amortization expense on capitalized leased assets	600,000	1,100,000
Net decrease in accumulated depreciation related to assets impaired		2,400,000
Reversal of accumulated depreciation	3,100,000	3,100,000
Reduction in accumulated depreciation related to fixed assets disposed		200,000
Reduction in accumulated depreciation related to change in foreign exchange rates		$ 200,000
Group One
Property, Plant and Equipment [Line Items]
Discount rate used for calculation of present value		50.00%
Minimum
Property, Plant and Equipment [Line Items]
Discount rate used for calculation of present value		16.00%
Maximum
Property, Plant and Equipment [Line Items]
Discount rate used for calculation of present value		20.00%