Annual report pursuant to Section 13 and 15(d)

Concentration of Credit Risks - Additional Information (Detail)

v2.4.0.8
Concentration of Credit Risks - Additional Information (Detail)
12 Months Ended
Dec. 31, 2013
Customer
Dec. 31, 2012
Customer
Dec. 31, 2011
Customer
Concentration Risk [Line Items]      
Number of major customers 3 3 3
Sales percentage by customer percentage maximum 5.00% 5.00% 5.00%
Purchase major vendor percentage 5.00% 6.70% 10.00%
Trade payable major vendor percentage 2.00% 4.70% 3.90%
Accounts receivable [Member]
     
Concentration Risk [Line Items]      
Major customer, accounted percentage 44.20% 49.70% 52.00%
Sales [Member]
     
Concentration Risk [Line Items]      
Major customer, accounted percentage 39.70% 40.10% 41.00%