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SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION - Supplemental Consolidating Statements of Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]          
Net income (loss) $ (19,030) $ (4,087) $ (8,127) $ (13,662) $ (36,875)
Other comprehensive income (loss)          
Amortization of accumulated actuarial gains or losses, pension 359 741 3,490 2,960 1,647
Adjustments to accumulated actuarial losses and transition obligations, pension     28,974 (9,812) (15,798)
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit 5 1,001 4,005 2,572 (288)
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits     53,230 (22,342) (49,136)
Tax effect of other comprehensive income gains (138) 0 (4,892) 0 0
Unrealized and realized gains and losses on available-for-sale securities     (57) (268) (200)
Other comprehensive loss 226 1,742 84,750 (26,890) (63,775)
Comprehensive income (loss) attributable to Westmoreland Coal Company (18,804) (2,345) 76,623 (40,552) (100,650)
Parent Company [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net income (loss) (19,030) (4,087) (8,127) (13,662) (36,875)
Other comprehensive income (loss)          
Amortization of accumulated actuarial gains or losses, pension     3,490 2,960 1,647
Adjustments to accumulated actuarial losses and transition obligations, pension     28,974 (9,812) (15,798)
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit     4,005 2,572 (288)
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits     53,230 (22,342) (49,136)
Tax effect of other comprehensive income gains     (4,892)    
Unrealized and realized gains and losses on available-for-sale securities     (57) (268) (200)
Other comprehensive loss 226 1,742 84,750 (26,890) (63,775)
Comprehensive income (loss) attributable to Westmoreland Coal Company (18,804) (2,345) 76,623 (40,552) (100,650)
Co-Issuer [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net income (loss) 1,703 (1,004) 4,215 8,113 5,089
Other comprehensive income (loss)          
Amortization of accumulated actuarial gains or losses, pension     28 23 9
Adjustments to accumulated actuarial losses and transition obligations, pension     180 (52) (150)
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit     0 0 0
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits     180 0 0
Tax effect of other comprehensive income gains     0    
Unrealized and realized gains and losses on available-for-sale securities     0 0 0
Other comprehensive loss 2 6 388 (29) (141)
Comprehensive income (loss) attributable to Westmoreland Coal Company 1,705 (998) 4,603 8,084 4,948
Guarantor Subsidiaries [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net income (loss) 7,409 10,126 36,310 44,805 15,186
Other comprehensive income (loss)          
Amortization of accumulated actuarial gains or losses, pension     801 720 86
Adjustments to accumulated actuarial losses and transition obligations, pension     13,331 (5,144) 72
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit     577 823 348
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits     14,548 (1,367) (5,934)
Tax effect of other comprehensive income gains     0    
Unrealized and realized gains and losses on available-for-sale securities     (55) (64) (203)
Other comprehensive loss 86 324 29,202 (5,032) (5,631)
Comprehensive income (loss) attributable to Westmoreland Coal Company 7,495 10,450 65,512 39,773 9,555
Non-Guarantor Subsidiaries [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net income (loss) 116 (1,612) (1,992) (7,503) (4,029)
Other comprehensive income (loss)          
Amortization of accumulated actuarial gains or losses, pension     61 46 36
Adjustments to accumulated actuarial losses and transition obligations, pension     475 (22) (516)
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit     275 150 (54)
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits     2,804 (1,467) (3,335)
Tax effect of other comprehensive income gains     0    
Unrealized and realized gains and losses on available-for-sale securities     0 0 0
Other comprehensive loss 11 82 3,615 (1,293) (3,869)
Comprehensive income (loss) attributable to Westmoreland Coal Company 127 (1,530) 1,623 (8,796) (7,898)
Consolidating Adjustments [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net income (loss) (9,228) (7,510) (38,533) (45,415) (16,246)
Other comprehensive income (loss)          
Amortization of accumulated actuarial gains or losses, pension     (890) (789) (131)
Adjustments to accumulated actuarial losses and transition obligations, pension     (13,986) 5,218 594
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit     (852) (973) (294)
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits     (17,532) 2,834 9,269
Tax effect of other comprehensive income gains     0    
Unrealized and realized gains and losses on available-for-sale securities     55 64 203
Other comprehensive loss (99) (412) (33,205) 6,354 9,641
Comprehensive income (loss) attributable to Westmoreland Coal Company (9,327) (7,922) (71,738) (39,061) (6,605)
Scenario, Previously Reported [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net income (loss) (19,030) (4,087) (8,127) (13,662) (36,875)
Other comprehensive income (loss)          
Amortization of accumulated actuarial gains or losses, pension 359 741 3,490 2,960 1,647
Adjustments to accumulated actuarial losses and transition obligations, pension     28,974 (9,812) (15,798)
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit 5 1,001 4,005 2,572 (288)
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits     53,230 (22,342) (49,136)
Tax effect of other comprehensive income gains (138)   (4,892)    
Unrealized and realized gains and losses on available-for-sale securities     (57) (268) (200)
Other comprehensive loss 226 1,742 84,750 (26,890) (63,775)
Comprehensive income (loss) attributable to Westmoreland Coal Company (18,804) (2,345) 76,623 (40,552) (100,650)
Scenario, Previously Reported [Member] | Parent Company [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net income (loss) (19,030) (4,087) (8,127) (13,662) (36,875)
Other comprehensive income (loss)          
Amortization of accumulated actuarial gains or losses, pension 359 741 3,490 2,960 1,647
Adjustments to accumulated actuarial losses and transition obligations, pension     28,974 (9,812) (15,798)
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit 5 1,001 4,005 2,572 (288)
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits     53,230 (22,342) (49,136)
Tax effect of other comprehensive income gains (138)   (4,892)    
Unrealized and realized gains and losses on available-for-sale securities     (57) (268) (200)
Other comprehensive loss 226 1,742 84,750 (26,890) (63,775)
Comprehensive income (loss) attributable to Westmoreland Coal Company (18,804) (2,345) 76,623 (40,552) (100,650)
Scenario, Previously Reported [Member] | Co-Issuer [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net income (loss) 1,703 (1,004) 4,215 8,113 5,089
Other comprehensive income (loss)          
Amortization of accumulated actuarial gains or losses, pension 2 6 28 23 9
Adjustments to accumulated actuarial losses and transition obligations, pension     180 (52) (150)
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit 0 0 0 0 0
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits     0 0 0
Tax effect of other comprehensive income gains 0   0    
Unrealized and realized gains and losses on available-for-sale securities     0 0 0
Other comprehensive loss 2 6 208 (29) (141)
Comprehensive income (loss) attributable to Westmoreland Coal Company 1,705 (998) 4,423 8,084 4,948
Scenario, Previously Reported [Member] | Guarantor Subsidiaries [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net income (loss) 5,803 6,876 16,079 37,771 3,463
Other comprehensive income (loss)          
Amortization of accumulated actuarial gains or losses, pension 0 0 0 0 0
Adjustments to accumulated actuarial losses and transition obligations, pension     10,554 (3,034) 0
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit (119) 0 0 0 0
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits     11,941 (1,969) 0
Tax effect of other comprehensive income gains 0   0    
Unrealized and realized gains and losses on available-for-sale securities     (17) 1 (103)
Other comprehensive loss (119) 0 22,478 (5,002) (103)
Comprehensive income (loss) attributable to Westmoreland Coal Company 5,684 6,876 38,557 32,769 3,360
Scenario, Previously Reported [Member] | Non-Guarantor Subsidiaries [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net income (loss) 726 1,141 13,072 (4,541) 5,073
Other comprehensive income (loss)          
Amortization of accumulated actuarial gains or losses, pension 128 193 863 766 702
Adjustments to accumulated actuarial losses and transition obligations, pension     3,252 (2,132) (444)
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit 88 213 852 973 295
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits     5,411 (865) (9,269)
Tax effect of other comprehensive income gains 0   0    
Unrealized and realized gains and losses on available-for-sale securities     (38) (65) (100)
Other comprehensive loss 216 406 10,340 (1,323) (8,816)
Comprehensive income (loss) attributable to Westmoreland Coal Company 942 1,547 23,412 (5,864) (3,743)
Scenario, Previously Reported [Member] | Consolidating Adjustments [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net income (loss) (8,232) (7,013) (33,366) (41,343) (13,625)
Other comprehensive income (loss)          
Amortization of accumulated actuarial gains or losses, pension (130) (199) (891) (789) (711)
Adjustments to accumulated actuarial losses and transition obligations, pension     (13,986) 5,218 594
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit 31 (213) (852) (973) (295)
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits     (17,352) 2,834 9,269
Tax effect of other comprehensive income gains 0   0    
Unrealized and realized gains and losses on available-for-sale securities     55 64 203
Other comprehensive loss (99) (412) (33,026) 6,354 9,060
Comprehensive income (loss) attributable to Westmoreland Coal Company $ (8,331) $ (7,425) $ (66,392) $ (34,989) $ (4,565)