Fair Value - Additional Information (Detail) (USD $)	Jun. 30, 2013		Dec. 31, 2012
Fair Value Measurements [Line Items]
Assets included in discontinued operations, current	$ 16,570,000	[1]	$ 0
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) | Other Current Assets [Member]
Fair Value Measurements [Line Items]
Assets held for sale, current	1,000,000
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) | Zhuhai [Member]
Fair Value Measurements [Line Items]
Assets included in discontinued operations, current	3,300,000
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) | Charlotte [Member]
Fair Value Measurements [Line Items]
Assets included in discontinued operations, current	$ 11,000,000

[1] All current assets of discontinued operations are assets held for sale.