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Contractual Obligations, Including Capital Expenditures and Future Minimum Lease Payments Under Non-Cancelable Operating Lease Arrangements and Purchase Commitments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Long-term Purchase Commitment [Line Items]  
Contractual Obligations $ 1us-gaap_ContractualObligation
Contractual Obligations, 2015 1us-gaap_ContractualObligationDueInNextTwelveMonths
Contractual Obligations, 2016   
Contractual Obligations, 2017   
Other purchase obligations  
Long-term Purchase Commitment [Line Items]  
Contractual Obligations 1us-gaap_ContractualObligation
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= us-gaap_PurchaseCommitmentMember
Contractual Obligations, 2015 1us-gaap_ContractualObligationDueInNextTwelveMonths
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= us-gaap_PurchaseCommitmentMember
Contractual Obligations, 2016   
Contractual Obligations, 2017