ACQUISITIONS: (Details) (USD $)	0 Months Ended		12 Months Ended
	Dec. 31, 2010	Dec. 23, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
ACQUISITIONS
Issuance of shares of common stock to acquiree	7,966,387
Per share value of shares of common stock issued to acquiree (in dollars per share)	$ 12.52				$ 12.52
Effective tax rate (as a percent)		37.00%	40.22%	46.88%	36.87%
Fair value, allocated to the assets contributed and liabilities assumed
Current assets, including cash and commodity derivatives		$ 14,765,773
Proved oil and gas properties		441,303,069
Unproved oil and gas properties		14,749,117
Wells in progress		7,569,802
Natural gas plant		31,840,475
Property and equipment		802,679
Other noncurrent assets, including commodity derivatives		5,357,346
Current liabilities, including commodity derivatives		(23,453,557)
Commodity derivatives, noncurrent		(5,673,460)
Deferred income taxes, net		(68,499,846)
Other noncurrent liabilities, including asset retirement obligations		(6,819,263)
Value of common stock issued as consideration		356,542,135
Bank revolving credit
Fair value, allocated to the assets contributed and liabilities assumed
Debt, including pre-payment penalty		(55,400,000)
Senior subordinated notes
Fair value, allocated to the assets contributed and liabilities assumed
Prepayment penalty		14,327,348
Second lien term loan
Fair value, allocated to the assets contributed and liabilities assumed
Prepayment penalty		3,031,667
Debt Extinguishment
Fair value, allocated to the assets contributed and liabilities assumed
Proved oil and gas properties		16,680,311
Unproved oil and gas properties		678,704
Value of common stock issued as consideration		216,812,115
Debt Extinguishment | Bank revolving credit
Fair value, allocated to the assets contributed and liabilities assumed
Debt, including pre-payment penalty		29,000,000
Debt Extinguishment | Senior subordinated notes
Fair value, allocated to the assets contributed and liabilities assumed
Debt, including pre-payment penalty		125,145,205
Debt Extinguishment | Second lien term loan
Fair value, allocated to the assets contributed and liabilities assumed
Debt, including pre-payment penalty		33,031,667
Debt Extinguishment | Note payable-related party
Fair value, allocated to the assets contributed and liabilities assumed
Debt, including pre-payment penalty		12,276,228
Deferred Tax Adjustment
Fair value, allocated to the assets contributed and liabilities assumed
Proved oil and gas properties		65,806,160
Unproved oil and gas properties		2,693,686
Deferred income taxes, net		(68,499,846)
HEC
ACQUISITIONS
Issuance of shares of common stock to acquiree		1,683,536
Per share value of shares of common stock issued to acquiree (in dollars per share)		$ 12.52
Cash paid for acquisition of all of ownership		59,000,000
Fair value, allocated to the assets contributed and liabilities assumed
Current assets, including cash and commodity derivatives		3,848,328
Proved oil and gas properties		77,985,048
Wells in progress		1,786,917
Property and equipment		25,115
Current liabilities, including commodity derivatives		(3,559,307)
Other noncurrent liabilities, including asset retirement obligations		(901,479)
Value of common stock issued as consideration		79,184,622
Bonanza Creek Energy Company, LLC (Predecessor)
ACQUISITIONS
Sale of shares of common stock to acquiree		21,166,134
Per share value of shares of common stock sold to acquiree (in dollars per share)		$ 12.52
Issuance of shares of common stock to acquiree		6,272,851
Per share value of shares of common stock issued to acquiree (in dollars per share)		$ 12.52
Fair value, allocated to the assets contributed and liabilities assumed
Current assets, including cash and commodity derivatives		10,917,445
Proved oil and gas properties		280,831,550
Unproved oil and gas properties		11,376,727
Wells in progress		5,782,885
Natural gas plant		31,840,475
Property and equipment		777,564
Other noncurrent assets, including commodity derivatives		5,357,346
Current liabilities, including commodity derivatives		(19,894,250)
Commodity derivatives, noncurrent		(5,673,460)
Other noncurrent liabilities, including asset retirement obligations		(5,917,784)
Value of common stock issued as consideration		60,545,398
Bonanza Creek Energy Company, LLC (Predecessor) | Bank revolving credit
Fair value, allocated to the assets contributed and liabilities assumed
Debt, including pre-payment penalty		(84,400,000)
Bonanza Creek Energy Company, LLC (Predecessor) | Senior subordinated notes
Fair value, allocated to the assets contributed and liabilities assumed
Debt, including pre-payment penalty		(125,145,205)
Bonanza Creek Energy Company, LLC (Predecessor) | Second lien term loan
Fair value, allocated to the assets contributed and liabilities assumed
Debt, including pre-payment penalty		(33,031,667)
Bonanza Creek Energy Company, LLC (Predecessor) | Note payable-related party
Fair value, allocated to the assets contributed and liabilities assumed
Debt, including pre-payment penalty		(12,276,228)
Bonanza Creek Energy Company, LLC (Predecessor) | HEC
ACQUISITIONS
Retirement of debt		182,000,000
Assumed penalties on extinguishment of debt		$ 17,000,000