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Industry Segment and Geographic Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Number of reportable operating segments                 2    
Financial information for reportable segment [Abstract]                      
Net sales                 $ 948,916 $ 874,625 $ 810,910
Intersegment sales                 0 0 0
Depreciation and amortization                 16,466 14,145 13,574
Operating income (loss)                 71,431 64,899 46,793
Investment in equity affiliates 0       0       0 0 435
Capital expenditures                 11,811 11,037 10,806
Total assets 576,594       550,722       576,594 550,722 492,801
Reconciliation of segment operating income to net earnings [Abstract]                      
Operating income                 71,431 64,899 46,793
Other non-operating income (expense)                 (696) 3,370 425
Interest expense                 2,788 3,821 7,127
Earnings from continuing operations before taxes                 67,947 64,448 40,091
Income tax expense                 24,978 121 15,391
Earnings from continuing operations 6,310 17,444 13,721 5,494 29,523 [1] 14,100 [1] 13,693 [1] 7,011 [1] 42,969 64,327 24,700
Discontinued operations, net of tax (395) (604) (317) (300) (212) (1,055) (355) (304) (1,616) (1,926) (2,740)
Net earnings 5,915 16,840 13,404 5,194 29,311 [1] 13,045 [1] 13,338 [1] 6,707 [1] 41,353 62,401 21,960
Revenues [Abstract]                      
Revenues 192,355 275,975 268,875 211,711 174,170 236,220 244,005 220,230 948,916 874,625 810,910
Long-lived assets [Abstract]                      
Long-lived assets 146,956       132,798       146,956 132,798 86,749
Number of largest individual customers                 5    
Five Largest Individual Customers [Member]
                      
Long-lived assets [Abstract]                      
Net sales by major customer (in hundredths)                 64.00% 62.00% 60.00%
NAPA Auto Parts [Member]
                      
Long-lived assets [Abstract]                      
Net sales by major customer (in hundredths)                 18.00%    
Advance Auto Parts, Inc. [Member]
                      
Long-lived assets [Abstract]                      
Net sales by major customer (in hundredths)                 15.00%    
O' Reilly Automotive, Inc. [Member]
                      
Long-lived assets [Abstract]                      
Net sales by major customer (in hundredths)                 19.00%    
United States [Member]
                      
Revenues [Abstract]                      
Revenues                 865,861 791,625 723,628
Long-lived assets [Abstract]                      
Long-lived assets 137,240       125,189       137,240 125,189 81,485
Canada [Member]
                      
Revenues [Abstract]                      
Revenues                 50,215 52,497 51,515
Long-lived assets [Abstract]                      
Long-lived assets 1,658       1,626       1,658 1,626 1,782
Europe [Member]
                      
Revenues [Abstract]                      
Revenues                 8,093 9,496 8,296
Long-lived assets [Abstract]                      
Long-lived assets 4,161       2,322       4,161 2,322 2,314
Other Foreign [Member]
                      
Revenues [Abstract]                      
Revenues                 24,747 21,007 27,471
Long-lived assets [Abstract]                      
Long-lived assets 3,897       3,661       3,897 3,661 1,168
Engine Management [Member]
                      
Financial information for reportable segment [Abstract]                      
Net sales                 665,105 628,673 577,333
Intersegment sales                 18,234 21,175 19,720
Depreciation and amortization                 13,093 11,599 10,378
Operating income (loss)                 69,578 56,261 43,410
Investment in equity affiliates 0       0       0 0 0
Capital expenditures                 8,941 9,014 8,376
Total assets 362,824       372,410       362,824 372,410 323,162
Reconciliation of segment operating income to net earnings [Abstract]                      
Operating income                 69,578 56,261 43,410
Temperature Control [Member]
                      
Financial information for reportable segment [Abstract]                      
Net sales                 268,804 233,723 222,086
Intersegment sales                 4,804 5,041 4,567
Depreciation and amortization                 2,924 1,772 2,073
Operating income (loss)                 15,019 17,699 13,096
Investment in equity affiliates 0       0       0 0 0
Capital expenditures                 2,005 1,949 2,336
Total assets 132,644       97,656       132,644 97,656 92,732
Reconciliation of segment operating income to net earnings [Abstract]                      
Operating income                 15,019 17,699 13,096
Other [Member]
                      
Financial information for reportable segment [Abstract]                      
Net sales                 15,007 12,229 11,491
Intersegment sales                 (23,038) (26,216) (24,287)
Depreciation and amortization                 449 774 1,123
Operating income (loss)                 (13,166) (9,061) (9,713)
Investment in equity affiliates 0       0       0 0 435
Capital expenditures                 865 74 94
Total assets 81,126       80,656       81,126 80,656 76,907
Reconciliation of segment operating income to net earnings [Abstract]                      
Operating income                 $ (13,166) $ (9,061) $ (9,713)
[1] In December 2011, we realized a non-recurring non-cash benefit of $21.5 million in our tax provision related to a reduction of a significant portion of our deferred tax valuation allowance on net U.S. deferred tax assets.