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Accounts Payable - Summary of Accounts Payable (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Payables And Accruals [Abstract]    
Accounts payable $ 47,557 $ 6,964
Retentions payable 3,690  
Accounts payable $ 51,247 $ 6,964