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Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period $ 561,212    
Total amount reclassified from accumulated other comprehensive loss, net of tax 0 $ 3,270 $ 0
Total other comprehensive income (loss) 61,249 (20,395) (42,886)
Balance at end of period 602,578 561,212  
(Loss) income from discontinued operations 0 245 (1,325)
Gain included in Currency exchange losses, net (5,127) (766) (2,204)
MSA Safety Incorporated - Pension and other post-retirement benefits      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (118,068) (119,389) (125,570)
Tax (expense) benefit (6,124) 5,033 4,173
Total other comprehensive loss before reclassifications, net of tax 11,535 (6,348) (4,433)
Tax benefit (4,293) (3,893) (5,333)
Total amount reclassified from accumulated other comprehensive loss, net of tax 8,585 7,669 10,614
Total other comprehensive income (loss) 20,120 1,321 6,181
Balance at end of period (97,948) (118,068) (119,389)
MSA Safety Incorporated - Net actuarial (losses) gains      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Unrecognized net actuarial losses/prior service credit (cost) 17,659 (12,473) (8,002)
Amounts reclassified from accumulated other comprehensive loss 13,054 11,989 16,215
MSA Safety Incorporated - Prior service (cost) credit      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Unrecognized net actuarial losses/prior service credit (cost) 0 1,092 (604)
Amounts reclassified from accumulated other comprehensive loss (176) (427) (268)
MSA Safety Incorporated - Foreign currency translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (112,178) (88,810) (41,160)
Total amount reclassified from accumulated other comprehensive loss, net of tax 0 (2,500) 0
Total other comprehensive income (loss) 38,364 (25,868) (47,650)
Balance at end of period (73,814) (112,178) (88,810)
(Loss) income from discontinued operations   3,400  
Gain included in Currency exchange losses, net   900  
Noncontrolling Interests - Pension and other post-retirement benefits      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period 0 0 0
Tax (expense) benefit 0 0 0
Total other comprehensive loss before reclassifications, net of tax 0 0 0
Tax benefit 0 0 0
Total amount reclassified from accumulated other comprehensive loss, net of tax 0 0 0
Balance at end of period 0 0 0
Noncontrolling Interests - Net actuarial (losses) gains      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Unrecognized net actuarial losses/prior service credit (cost) 0 0 0
Amounts reclassified from accumulated other comprehensive loss 0 0 0
Noncontrolling Interests - Prior service credit (cost)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Unrecognized net actuarial losses/prior service credit (cost) 0 0 0
Amounts reclassified from accumulated other comprehensive loss 0 0 0
Noncontrolling Interests - Foreign currency translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (1,964) (3,616) (2,199)
Total amount reclassified from accumulated other comprehensive loss, net of tax 0 (770) 0
Total other comprehensive income (loss) 2,765 882 (1,417)
Balance at end of period $ 801 $ (1,964) $ (3,616)