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Business Segments - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2015
Segment
Segment Reporting Information [Line Items]  
Number of offshore drilling rigs 35l_NumberOfOffshoreDrillingRigs
Number of rigs, plans to retire and scrap 3l_NumberOfRigsRetireAndScrapped
Number of rigs under construction 2l_NumberOfNewConstructionRigs
Number of countries where drilling rigs are located 8l_NumberOfCountriesWhereDrillingRigsLocated
Miles of natural gas and NGL pipeline 14,625l_MilesOfNaturalGasPipeline
Number of states having natural gas storage facilities 4l_NumberOfStatesHavingNaturalGasStorageFacilities
Total number of hotels owned and/or operated 23l_NumberOfParentHotelsOwned
United States [Member]  
Segment Reporting Information [Line Items]  
Number of hotels 22l_NumberOfHotels
/ us-gaap_StatementGeographicalAxis
= country_US
Canada [Member]  
Segment Reporting Information [Line Items]  
Number of hotels 1l_NumberOfHotels
/ us-gaap_StatementGeographicalAxis
= country_CA
Commercial [Member] | Core Operations [Member]  
Segment Reporting Information [Line Items]  
Number of CNA segments 4us-gaap_NumberOfOperatingSegments
/ us-gaap_ProductOrServiceAxis
= l_CoreOperationsMember
/ us-gaap_StatementBusinessSegmentsAxis
= l_CnaCommercialMember