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Industry Segment and Geographic Data (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 Customer Segment | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable operating segments |  |  |  |  |  |  |  |  | 2 |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 983,704 | $ 948,916 | $ 874,625
Depreciation and amortization |  |  |  |  |  |  |  |  | 17,595 | 16,466 | 14,145
Operating income (loss) |  |  |  |  |  |  |  |  | 86,863 | 71,431 | 64,899
Investment in equity affiliates | 6,308 |  |  |  | 0 |  |  |  | 6,308 | 0 | 0
Capital expenditures | 11,410 |  |  |  | 11,811 |  |  |  | 11,410 | 11,811 | 11,037
Total assets | 615,523 |  |  |  | 576,594 |  |  |  | 615,523 | 576,594 | 550,722
Reconciliation of segment operating income to net earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 86,863 | 71,431 | 64,899
Other non-operating income (expense) |  |  |  |  |  |  |  |  | 1 | (696) | 3,370
Interest expense |  |  |  |  |  |  |  |  | 1,902 | 2,788 | 3,821
Earnings from continuing operations before taxes |  |  |  |  |  |  |  |  | 84,962 | 67,947 | 64,448
Income tax expense |  |  |  |  |  |  |  |  | 31,919 | 24,978 | 121
Earnings from continuing operations | 9,391 | 17,686 | 16,400 | 9,566 | 6,310 | 17,444 | 13,721 | 5,494 | 53,043 | 42,969 | 64,327
Discontinued operations, net of tax | (455) | (389) | (357) | (392) | (395) | (604) | (317) | (300) | (1,593) | (1,616) | (1,926)
Net earnings | 8,936 | 17,297 | 16,043 | 9,174 | 5,915 | 16,840 | 13,404 | 5,194 | 51,450 | 41,353 | 62,401
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | 218,708 | 264,162 | 270,126 | 230,708 | 192,355 | 275,975 | 268,875 | 211,711 | 983,704 | 948,916 | 874,625
Long-lived assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 159,167 |  |  |  | 146,956 |  |  |  | 159,167 | 146,956 | 132,798
Number of largest individual customers |  |  |  |  |  |  |  |  | 5 |  |
Net sales by major customer (in hundredths) |  |  |  |  |  |  |  |  | 66.00% | 64.00% | 62.00%
Five Largest Individual Customers [Member] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales by major customer (in hundredths) |  |  |  |  |  |  |  |  | 66.00% | 64.00% | 62.00%
NAPA Auto Parts [Member] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales by major customer (in hundredths) |  |  |  |  |  |  |  |  | 19.00% |  |
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) |  |  |  |  |  |  |  |  | 18.00% |  |
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 884,380 | 865,861 | 791,625
Long-lived assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 135,834 |  |  |  | 137,240 |  |  |  | 135,834 | 137,240 | 125,189
Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 51,853 | 50,215 | 52,497
Long-lived assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 1,526 |  |  |  | 1,658 |  |  |  | 1,526 | 1,658 | 1,626
Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 10,657 | 8,093 | 9,496
Long-lived assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 11,310 |  |  |  | 4,161 |  |  |  | 11,310 | 4,161 | 2,322
Other Foreign [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 36,814 | 24,747 | 21,007
Long-lived assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 10,497 |  |  |  | 3,897 |  |  |  | 10,497 | 3,897 | 3,661
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Engine Management [Member] |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 711,245 | 665,105 | 628,673
Depreciation and amortization |  |  |  |  |  |  |  |  | 13,235 | 13,093 | 11,599
Operating income (loss) |  |  |  |  |  |  |  |  | 96,335 | 69,578 | 56,261
Investment in equity affiliates | 6,308 |  |  |  | 0 |  |  |  | 6,308 | 0 | 0
Capital expenditures | 8,628 |  |  |  | 8,941 |  |  |  | 8,628 | 8,941 | 9,014
Total assets | 384,712 |  |  |  | 362,824 |  |  |  | 384,712 | 362,824 | 372,410
Reconciliation of segment operating income to net earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 96,335 | 69,578 | 56,261
Engine Management [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 25,720 | 18,234 | 21,175
Temperature Control [Member] |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 262,537 | 268,804 | 233,723
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,763 | 2,924 | 1,772
Operating income (loss) |  |  |  |  |  |  |  |  | 9,147 | 15,019 | 17,699
Investment in equity affiliates | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Capital expenditures | 2,682 |  |  |  | 2,005 |  |  |  | 2,682 | 2,005 | 1,949
Total assets | 150,280 |  |  |  | 132,644 |  |  |  | 150,280 | 132,644 | 97,656
Reconciliation of segment operating income to net earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 9,147 | 15,019 | 17,699
Temperature Control [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,329 | 4,804 | 5,041
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,922 | 15,007 | 12,229
Depreciation and amortization |  |  |  |  |  |  |  |  | 597 | 449 | 774
Operating income (loss) |  |  |  |  |  |  |  |  | (18,619) | (13,166) | (9,061)
Investment in equity affiliates | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Capital expenditures | 100 |  |  |  | 865 |  |  |  | 100 | 865 | 74
Total assets | 80,531 |  |  |  | 81,126 |  |  |  | 80,531 | 81,126 | 80,656
Reconciliation of segment operating income to net earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (18,619) | (13,166) | (9,061)
Other [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ (32,049) | $ (23,038) | $ (26,216)

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