Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Schedule of Adjusted of the Condensed Consolidating Statements of Cash Flows (Details)

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Basis of Presentation - Schedule of Adjusted of the Condensed Consolidating Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Basis Of Presentation [Line Items]    
Prepaid expenses and other assets $ 17,246 $ 2,709
Accounts payable, accrued liabilities and other (10,263) (3,285)
Net cash provided by operating activities 52,918 136,055
Changes in operating assets and liabilities associated with investing activities (52,176) (17,565)
Net cash used in investing activities (135,167) (112,892)
Net cash provided by financing activities 66,950 (18,628)
Decrease in cash and cash equivalents (15,299) 4,535
Cash and cash equivalents, end of period 8,367 20,335
Parent Company    
Basis Of Presentation [Line Items]    
Prepaid expenses and other assets (21,690) (58,791)
Accounts payable, accrued liabilities and other (40,260) 86,795
Net cash provided by operating activities (40,914) 93,382
Changes in operating assets and liabilities associated with investing activities (22,562) 6,316
Net cash used in investing activities (41,335) (70,219)
Net cash provided by financing activities 66,950 (18,628)
Decrease in cash and cash equivalents (15,299) 4,535
Cash and cash equivalents, end of period 8,367 $ 20,335
Energy VI    
Basis Of Presentation [Line Items]    
Prepaid expenses and other assets 68,599  
Net cash provided by operating activities 93,832  
Changes in operating assets and liabilities associated with investing activities (29,614)  
Net cash used in investing activities (93,629)  
Net cash provided by financing activities (203)  
As Previously Reported    
Basis Of Presentation [Line Items]    
Accounts payable, accrued liabilities and other (62,439)  
Net cash provided by operating activities 742  
Net cash used in investing activities (82,991)  
Net cash provided by financing activities 66,950  
Decrease in cash and cash equivalents (15,299)  
Cash and cash equivalents, end of period 8,367  
As Previously Reported | Parent Company    
Basis Of Presentation [Line Items]    
Prepaid expenses and other assets 7,924  
Accounts payable, accrued liabilities and other (92,436)  
Net cash provided by operating activities (63,476)  
Net cash used in investing activities (18,773)  
Net cash provided by financing activities 66,950  
Decrease in cash and cash equivalents (15,299)  
Cash and cash equivalents, end of period 8,367  
As Previously Reported | Energy VI    
Basis Of Presentation [Line Items]    
Prepaid expenses and other assets 38,985  
Net cash provided by operating activities 64,218  
Net cash used in investing activities (64,015)  
Net cash provided by financing activities (203)  
Adjustment    
Basis Of Presentation [Line Items]    
Accounts payable, accrued liabilities and other 52,176  
Net cash provided by operating activities 52,176  
Changes in operating assets and liabilities associated with investing activities (52,176)  
Net cash used in investing activities (52,176)  
Adjustment | Parent Company    
Basis Of Presentation [Line Items]    
Prepaid expenses and other assets (29,614)  
Accounts payable, accrued liabilities and other 52,176  
Net cash provided by operating activities 22,562  
Changes in operating assets and liabilities associated with investing activities (22,562)  
Net cash used in investing activities (22,562)  
Adjustment | Energy VI    
Basis Of Presentation [Line Items]    
Prepaid expenses and other assets 29,614  
Net cash provided by operating activities 29,614  
Changes in operating assets and liabilities associated with investing activities (29,614)  
Net cash used in investing activities $ (29,614)