| Related Party Transactions (Details) | 12 Months Ended | |||
|---|---|---|---|---|
| Dec. 31, 2014
 USD ($) | Dec. 31, 2013
 USD ($) | Dec. 31, 2012
 USD ($) | Dec. 31, 2014
 CNY | |
| Related Party Transactions [Abstract] | ||||
| Related party service fees | $ 8,638,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty | |||
| Related party sourcing fees | 388,000us-gaap_CostsAndExpensesRelatedParty | |||
| Note payable to related party | 15,728,000us-gaap_NotesPayableRelatedPartiesNoncurrent | 0us-gaap_NotesPayableRelatedPartiesNoncurrent | 97,600,000us-gaap_NotesPayableRelatedPartiesNoncurrent | |
| Related party note payable maturity date | Dec. 31, 2018 | |||
| Related party note payable interest rate | 7.00%us-gaap_RelatedPartyTransactionRate | |||
| Interest expense on note payable to related party | 1,053,000us-gaap_InterestExpenseRelatedParty | 0us-gaap_InterestExpenseRelatedParty | 0us-gaap_InterestExpenseRelatedParty | |
| Accounts payable to related party | $ 3,651,000us-gaap_AccountsPayableRelatedPartiesCurrent | |||
| X | ||||||||||
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- Definition Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition Costs of sales and operating expenses for the period incurred from transactions with related parties. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition Amount of interest expense incurred on a debt or other obligation to related party. No definition available. 
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| X | ||||||||||
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- Definition The amount for notes payable (written promise to pay), payable to related parties, which are due after one year (or one business cycle). Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition Date of maturity or expiration of arrangements with a related party (for example, but not limited to, leasing and debt arrangements between related parties), in CCYY-MM-DD format. No definition available. 
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| X | ||||||||||
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties. No definition available. 
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| X | ||||||||||
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- Details 
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