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Accounts Receivable - Summary of Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contract receivables $ 43,218us-gaap_ReceivablesLongTermContractsOrPrograms $ 26,249us-gaap_ReceivablesLongTermContractsOrPrograms
Allowance for doubtful accounts (699)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (700)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, Total 58,394us-gaap_AccountsReceivableNetCurrent 44,364us-gaap_AccountsReceivableNetCurrent
Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 15,875us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
$ 18,815us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember