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Accounts Receivable - Summary of Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts $ (700) $ (565)
Accounts receivable, Total 44,364 29,499
Trade Accounts Receivable [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables 18,815 3,893
Contract Receivables [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables $ 26,249 $ 26,171