XML 75 R46.htm IDEA: XBRL DOCUMENT v3.3.1.900
Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Millions
 3 Months Ended 12 Months Ended
Feb. 18, 2016
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Mar. 01, 2016
shares
Feb. 17, 2016
shares
Dec. 31, 2014
USD ($)
shares
Oct. 31, 2014
Sep. 30, 2013
Schedule Of Significant Accounting Policies [Line Items]                
Rate of senior notes   9.125% 9.125%          
Long-term debt   $ 1,384,996,000 $ 1,384,996,000     $ 1,475,223,000    
Common units outstanding (in shares) | shares   12.2 12.2     12.2    
Common units outstanding (in shares) | shares       12.2        
Allowance for doubtful accounts   $ 5,300,000 $ 5,300,000     $ 700,000    
Oil and gas royalty interests useful life (in years)     30 years          
Asset impairment     $ 676,100,000          
Impairment loss   $ 5,500,000            
Minimum [Member]                
Schedule Of Significant Accounting Policies [Line Items]                
Ownership interest of Partnership with significant influence (percent)   20.00% 20.00%          
Maximum [Member]                
Schedule Of Significant Accounting Policies [Line Items]                
Ownership interest of Partnership with significant influence (percent)   50.00% 50.00%          
Restatement Adjustment [Member]                
Schedule Of Significant Accounting Policies [Line Items]                
Depletion     $ (3,800,000)          
Subsequent Event [Member]                
Schedule Of Significant Accounting Policies [Line Items]                
Common units outstanding (in shares) | shares 12.2       122.3      
NRP LP                
Schedule Of Significant Accounting Policies [Line Items]                
Rate of senior notes             9.125% 9.125%
NRP LP | 9.125% senior notes, with semi-annual interest payments in April and October, maturing October 2018                
Schedule Of Significant Accounting Policies [Line Items]                
Debt Instrument, face Amount   $ 425,000,000 $ 425,000,000          
Rate of senior notes   9.125% 9.125%          
Long-term debt   $ 422,923,000 $ 422,923,000     422,167,000    
NRP LP | Senior Notes                
Schedule Of Significant Accounting Policies [Line Items]                
Rate of senior notes   9.125% 9.125%          
Long-term debt   $ 422,900,000 $ 422,900,000          
Opco                
Schedule Of Significant Accounting Policies [Line Items]                
Ratio of consolidated indebtedness to consolidated EBITDDA     4.0          
Opco | $300 million floating rate revolving credit facility, due October 2017                
Schedule Of Significant Accounting Policies [Line Items]                
Long-term debt   290,000,000 $ 290,000,000     0    
Opco | Senior Notes                
Schedule Of Significant Accounting Policies [Line Items]                
Long-term debt   585,900,000 $ 585,900,000          
NRP Oil and Gas                
Schedule Of Significant Accounting Policies [Line Items]                
Leverage ratio, maximum     3.5          
Revolving Credit Facility | Opco | Fiscal Quarter Ending on or Before March 31, 2016 [Member]                
Schedule Of Significant Accounting Policies [Line Items]                
Ratio of consolidated indebtedness to consolidated EBITDDA     4.0          
Revolving Credit Facility | Opco | Fiscal Quarter Ending on or Before March 31, 2017 [Member]                
Schedule Of Significant Accounting Policies [Line Items]                
Ratio of consolidated indebtedness to consolidated EBITDDA     3.75          
Revolving Credit Facility | Opco | Fiscal Quarter Ending on or After June 30, 2017 [Member]                
Schedule Of Significant Accounting Policies [Line Items]                
Ratio of consolidated indebtedness to consolidated EBITDDA     3.5          
Revolving Credit Facility | NRP Oil and Gas                
Schedule Of Significant Accounting Policies [Line Items]                
Borrowings outstanding   $ 85,000,000 $ 85,000,000     $ 110,000,000    
Leverage ratio, maximum     3.5          
Common Stock [Member] | Subsequent Event [Member]                
Schedule Of Significant Accounting Policies [Line Items]                
Reverse split ratio, common units 0.1              
VantaCore                
Schedule Of Significant Accounting Policies [Line Items]                
Impairment loss     $ 5,500,000          
Brp Llc [Member]                
Schedule Of Significant Accounting Policies [Line Items]                
Percentage of partnership interest owned (percent)   51.00% 51.00%