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Summary of Significant Accounting Policies - Schedule of Number of Customers that Accounted for More than Ten Percentage of Annual Sales and Receivable Balances (Detail)
Dec. 31, 2013
Person
Dec. 31, 2012
Person
Regulatory Assets [Abstract]    
Number of Customers 1 1
Customers Exceeding 10% of Revenue Revenue Combined Percent 76.00% 89.00%
Accounts Receivable Combined Percent 31.00% 71.00%