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Accounts Receivable, Net - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Customer
Dec. 31, 2013
Customer
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable reserved $ 8.9xnet_AccountsReceivableReserve $ 10.9xnet_AccountsReceivableReserve
Number of top customers 10xnet_NumberOfMajorCustomers 10xnet_NumberOfMajorCustomers
Credit concentration risk [Member] | Accounts receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, percentage 37.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
40.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember