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Basis of presentation and significant accounting policies - Current assets and liabilities (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Accounts receivable    
Term of accounts receivable to be considered as past due (in days) 30 days  
Term of past due balances to be reviewed individually for collectability (in days) 90 days  
Oil, NGL and natural gas sales $ 44,859,000lpi_AccountsReceivableOilAndGasSalesNetCurrent $ 57,070,000lpi_AccountsReceivableOilAndGasSalesNetCurrent
Joint operations, net 25,752,000us-gaap_OilAndGasJointInterestBillingReceivablesCurrent [1] 33,808,000us-gaap_OilAndGasJointInterestBillingReceivablesCurrent [1]
Matured derivatives 20,829,000lpi_AccountsReceivableMaturedDerivativesCurrent 16,098,000lpi_AccountsReceivableMaturedDerivativesCurrent
Purchased oil and other product sales 17,963,000lpi_AccountsReceivablePurchasedOilandOtherProductSalesCurrent 18,917,000lpi_AccountsReceivablePurchasedOilandOtherProductSalesCurrent
Other 600,000us-gaap_OtherReceivablesNetCurrent 1,036,000us-gaap_OtherReceivablesNetCurrent
Total 110,003,000us-gaap_AccountsReceivableNetCurrent 126,929,000us-gaap_AccountsReceivableNetCurrent
Allowance for doubtful accounts of accounts receivable for joint operations 100,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 800,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Other current assets    
Prepaid expenses 18,043,000us-gaap_PrepaidExpenseCurrent 6,451,000us-gaap_PrepaidExpenseCurrent
Materials and supplies inventory and other 9,387,000us-gaap_InventoryNet 7,951,000us-gaap_InventoryNet
Total other current assets 27,430,000us-gaap_OtherAssetsCurrent 14,402,000us-gaap_OtherAssetsCurrent
Other current liabilities    
Accrued interest payable 27,969,000us-gaap_InterestPayableCurrent 37,689,000us-gaap_InterestPayableCurrent
Lease operating expense payable 17,121,000lpi_LeaseOperatingExpenseAccrual 11,963,000lpi_LeaseOperatingExpenseAccrual
Other accrued liabilities 27,958,000us-gaap_OtherAccruedLiabilitiesCurrent 51,380,000us-gaap_OtherAccruedLiabilitiesCurrent
Total other current liabilities $ 73,048,000us-gaap_OtherLiabilitiesCurrent $ 101,032,000us-gaap_OtherLiabilitiesCurrent
[1] Accounts receivable for joint operations are presented net of an allowance for doubtful accounts of $0.1 million and $0.8 million as of March 31, 2015 and December 31, 2014, respectively.