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Warrant Dividend (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2011
Stockholders' Equity [Abstract]      
Dividend declaration date Aug. 06, 2013    
Dividend date of record Jul. 29, 2013    
Number of warrants received for each share of common stock (in shares) 5lgl_DividendWarrantsReceivedPerShareOfCommonStock    
Number of warrants that entitle holder to purchase one share of common stock (in shares) 25lgl_NumberOfWarrantsToPurchaseOneShareCommonStock    
Warrant exercise price (in dollars per share) $ 7.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1    
Minimum volume weighted average price per share (in dollars per share) $ 15.00lgl_MinimumVolumeWeightedAverageExercisePriceToExerciseWarrants    
Maximum number of common shares authorized to be repurchased (in shares)     100,000lgl_StockRepurchaseProgramNumberOfAdditionalSharesAuthorizedToBeRepurchased
Total number of shares authorized and available for repurchase (in shares)     540,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Treasury Stock, Shares 79,664us-gaap_TreasuryStockShares 79,716us-gaap_TreasuryStockShares  
Repurchased common stock, value $ 572us-gaap_TreasuryStockValue $ 572us-gaap_TreasuryStockValue