Related Party Transactions and Relationships and Transactions With Certain Other Parties (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Amounts outstanding with the related parties    
Purchase of transportation services (a) $ 1,127 [1] $ 628 [1]
Loan guarantee fee (b)    [2] 23 [2]
Advance payments to related parties (c) 41 [3] 698 [3]
Amounts due to related parties(d) $ 238 [4]    [4]
[1] The Group purchased transportation services of $1.1 million and approximately $0.6 million from Ningbo Xinhe during the three months ended March 31, 2014 and 2013, respectively.
[2] Guarantees for Bank Loans
[3] Advance payments to related parties consist of advances made for business purposes to Mr. Tao. These amounts are unsecured interest free and due on demand.
[4] At March 31, 2014, approximately $0.2 million was due to Ningbo Xinhe.