Debt - Additional Information (Details)								1 Months Ended	2 Months Ended	3 Months Ended		4 Months Ended	6 Months Ended		12 Months Ended
	Jun. 05, 2015 USD ($) debt_class borrowing_base	Apr. 13, 2015 USD ($)	Mar. 16, 2015 USD ($)	Mar. 13, 2015 USD ($)	Mar. 10, 2015 USD ($)	Jul. 01, 2013 USD ($)	Jun. 05, 2013 USD ($)	Mar. 31, 2010 USD ($)	Jun. 15, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Apr. 13, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Apr. 30, 2015 USD ($)	Dec. 31, 2014
Line of Credit Facility [Line Items]
Issue of cash convertible senior subordinated notes								$ 375,000,000
Debt maturity date								Mar. 15, 2015
Payment of convertible notes			$ 119,300,000										$ 117,259,000	$ 0
Payment of convertible notes, principal amount			117,300,000
Payment of convertible notes, interest portion			$ 2,100,000
Notes bear interest rate per year								3.50%
Date of commencing of notes								Sep. 15, 2010
Debt make-whole premium										$ 25,006,000	$ 1,995,000		25,006,000	9,552,000
Proceeds from issuance of debt, net													494,810,000	0
Amortization of debt issuance cost										$ 9,428,000	2,791,000		10,362,000	11,557,000
First Lien Credit Facility [Member] | Jefferies Finance LLC and Goldman Sachs Bank USA [Member]
Line of Credit Facility [Line Items]
Writedown of capitalized debt costs														9,600,000
Term credit agreement						$ 535,000,000
Principal payments														235,000,000	$ 300,000,000
Cash held in collateral account															$ 117,300,000
Revolving Credit Facility [Member] | Jefferies Finance LLC and Goldman Sachs Bank USA [Member]
Line of Credit Facility [Line Items]
Revolving credit facility amount						50,000,000
OCTEG-KCA [Member]
Line of Credit Facility [Line Items]
Revolving credit facility amount						450,000,000
OCTEG-KCA [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Term credit agreement	$ 355,000,000
Revolving credit facility amount	$ 500,000,000
Number of debt instruments | debt_class	2
Increase in line of credit facility, maximum borrowing capacity	$ 145,000,000					$ 300,000,000
Commitment fee percentage of average daily amount unused portion of revolving credit agreement	0.40%					0.35%
Debt issuance costs incurred													$ 1,400,000
OCTEG-KCA [Member] | Revolving Credit Facility [Member] | Borrowing Base A [Member]
Line of Credit Facility [Line Items]
Percentage points added to interest rate base	1.50%					1.75%
OCTEG-KCA [Member] | Revolving Credit Facility [Member] | Borrowing Base B Loan [Member]
Line of Credit Facility [Line Items]
Revolving credit facility amount						$ 150,000,000
Percentage points added to interest rate base	2.50%					2.25%
OCTEG-KCA [Member] | Swingline Facilty [Member]
Line of Credit Facility [Line Items]
Revolving credit facility amount	$ 50,000,000
Number of borrowing base | borrowing_base	2
OCTEG-KCA [Member] | Swingline Facilty [Member] | Borrowing Base A and Borrowing Base B [Member]
Line of Credit Facility [Line Items]
Revolving credit facility amount	$ 115,000,000
Senior Secured Notes [Member]
Line of Credit Facility [Line Items]
Writedown of capitalized debt costs											2,000,000			9,600,000
Principal payments											$ 50,000,000			$ 235,000,000
Senior Secured Notes [Member] | 8.25% Senior Secured Notes [Member]
Line of Credit Facility [Line Items]
Interest rate							8.25%			8.25%			8.25%				8.25%
Aggregate principal amount				$ 305,000,000			$ 305,000,000									$ 305,000,000
Escrow agent fees and expenses						$ 3,000,000
Redemption notice, period				30 days
Funds held in escrow		$ 330,200,000										$ 330,200,000
Accrued interest for the period												$ 8,200,000
Make-whole premium percentage												4.125%
Debt make-whole premium		16,500,000							$ 16,500,000
Other miscellaneous charges									$ 400,000
Writedown of capitalized debt costs		$ 8,500,000								$ 8,500,000			$ 8,500,000
Senior Secured Notes [Member] | 8.25% Senior Secured Notes [Member] | Prior to June 15, 2015 [Member]
Line of Credit Facility [Line Items]
Redemption price percentage							100.00%
Senior Secured Notes [Member] | 6.875% Senior Secured Notes [Member]
Line of Credit Facility [Line Items]
Interest rate					6.875%					6.875%			6.875%
Redemption price percentage					106.875%
Issuance of debt, percentage					98.962%
Proceeds from issuance of debt, net					$ 494,800,000
Yield to maturity, percentage					7.083%					7.588%			7.588%
Percentage in voting equity interests of controlled foreign subsidiaries				66.00%
Redemption period					12 months
Maximum redemption percentage of principal amount					40.00%
Senior Secured Notes [Member] | 6.875% Senior Secured Notes [Member] | Other Assets [Member]
Line of Credit Facility [Line Items]
Deferred debt costs										$ 12,600,000			$ 12,600,000
Senior Secured Notes [Member] | 6.875% Senior Secured Notes [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Redemption notice, period					30 days
Senior Secured Notes [Member] | 6.875% Senior Secured Notes [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Redemption notice, period					60 days
Senior Secured Notes [Member] | 6.875% Senior Secured Notes [Member] | Jefferies LLC [Member]
Line of Credit Facility [Line Items]
Aggregate principal amount					$ 500,000,000
Senior Secured Notes [Member] | 6.875% Senior Secured Notes [Member] | Prior to March 15, 2017 [Member]
Line of Credit Facility [Line Items]
Redemption price percentage					100.00%
Senior Secured Notes [Member] | 6.875% Indenture [Member]
Line of Credit Facility [Line Items]
Interest rate				6.875%