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Accounts Receivable - Components of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Receivables [Abstract]    
Other co-venturers $ 4,639 $ 16,291
Trade 26,224 60,263
Unbilled accounts receivable 1,736 33,052
Other 15,432 10,753
Total accounts receivable $ 48,031 $ 120,359