Debt - Chinese Credit Facilities - Additional Information (Details)					3 Months Ended
	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 31, 2014 Chinese Credit Facility USD ($)	Dec. 31, 2013 Chinese Credit Facility USD ($)	Mar. 31, 2014 Chinese Credit Facility-BOA USD ($)	Mar. 31, 2014 Chinese Credit Facility-BOA CNY	Mar. 31, 2014 Chinese Credit Facility-JPM	Apr. 30, 2012 Chinese Credit Facility-JPM USD ($)	Apr. 30, 2012 Chinese Credit Facility-JPM CNY
Debt Instrument [Line Items]
Borrowings, current (note 6)	$ 40,000,000	$ 40,000,000	$ 31,000,000	$ 28,000,000
Borrowing capacity under Chinese Credit Facility					30,000,000	189,000,000		20,000,000	125,000,000
Period of Term Loan Facility					1 year	1 year	1 year
Chinese Credit Facility borrowings	$ 31,000,000	$ 28,000,000			$ 13,000,000			$ 18,000,000
Line of credit rate basis					100.00%	100.00%	100.00%
Borrowings, interest rate basis					5.60%	5.60%		5.60%	5.60%
Interest rate of Chinese Credit Facility BOA					Chinese Credit Facility—BOA currently bears interest at a rate based on 100% of the People’s Bank of China’s base rate, which was 5.6% as of March 31, 2014	Chinese Credit Facility—BOA currently bears interest at a rate based on 100% of the People’s Bank of China’s base rate, which was 5.6% as of March 31, 2014	Chinese Credit Facility—JPM currently bears interest at a rate based on 100% of the People’s Bank of China’s base rate, which was 5.6% as of March 31, 2014.