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Supplementary Unrestricted Subsidiary Information - CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Income Statements, Captions [Line Items]                      
Revenues $ 116,063 $ 125,479 $ 137,630 $ 109,677 $ 137,273 $ 91,609 $ 90,561 $ 80,309 $ 488,849 $ 399,752 $ 358,117
Operating expenses                 966,760 210,833 121,881
Income (loss) from operations 2,042 (576,290) 55,920 40,417 31,050 55,027 50,403 52,439 (477,911) 188,919 236,236
Other expense                 93,809 80,089 64,158
Net income (loss) $ (21,786) $ (600,001) $ 32,578 $ 17,489 $ 8,645 $ 36,173 $ 31,407 $ 32,605 (571,720) 108,830 172,078
Add: comprehensive income (loss) from unconsolidated investment and other                 (1,693) (81) 65
Comprehensive income (loss)                 (573,413) 108,749 172,143
Unrestricted Subsidiaries of NRP                      
Condensed Income Statements, Captions [Line Items]                      
Revenues                 56,091 56,840 14,386
Operating expenses                 361,166 41,754 8,812
Income (loss) from operations                 (305,075) 15,086 5,574
Other expense                 4,065 662 39
Net income (loss)                 (309,140) 14,424 5,535
Add: comprehensive income (loss) from unconsolidated investment and other                 0 0 0
Comprehensive income (loss)                 (309,140) 14,424 5,535
NRP and its Restricted Subsidiaries                      
Condensed Income Statements, Captions [Line Items]                      
Revenues                 432,758 342,912 343,731
Operating expenses                 605,594 169,079 113,069
Income (loss) from operations                 (172,836) 173,833 230,662
Other expense                 89,744 79,427 64,119
Net income (loss)                 (262,580) 94,406 166,543
Add: comprehensive income (loss) from unconsolidated investment and other                 (1,693) (81) 65
Comprehensive income (loss)                 $ (264,273) $ 94,325 $ 166,608