2.4.0.8133 - Disclosure - Stock Repurchase Plan - Additional Information (Detail)truefalseIn Millions, except Share data, unless otherwise specifiedfalse1false USDfalsefalse$P01_01_2013To06_30_2013http://www.sec.gov/CIK0000060977duration2013-01-01T00:00:002013-06-30T00:00:00sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false truefalsePAsOn04_30_2012_ShareRepurchaseProgramTwoThousandAndTwelveMemberusgaapShareRepurchaseProgramAxishttp://www.sec.gov/CIK0000060977instant2012-04-30T00:00:000001-01-01T00:00:00falsefalseShare Repurchase Program Two Thousand and Twelve [Member]us-gaap_ShareRepurchaseProgramAxisxbrldihttp://xbrl.org/2006/xbrldildl_ShareRepurchaseProgramTwoThousandAndTwelveMemberus-gaap_ShareRepurchaseProgramAxisexplicitMembersharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli03false USDtruefalse$P01_01_2013To06_30_2013_StockRepurchaseProgram2012MemberusgaapShareRepurchaseProgramAxishttp://www.sec.gov/CIK0000060977duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseStock Repurchase Program 2012 [Member]us-gaap_ShareRepurchaseProgramAxisxbrldihttp://xbrl.org/2006/xbrldildl_StockRepurchaseProgram2012Memberus-gaap_ShareRepurchaseProgramAxisexplicitMembersharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USD_per_ShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3ldl_SharerePurchasesLineItemsldl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Sharere Purchases [Line Items]2false 4us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchasedus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse10000001000000falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:sharesItemTypesharesThe number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.No definition available.false1Stock Repurchase Program, Number of Shares Authorized to be Repurchased3false 4us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchasedus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse267089267089falsefalsefalsexbrli:sharesItemTypesharesThe remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.No definition available.false1Remaining authorized funds for stock repurchase4false 4us-gaap_StockRepurchasedDuringPeriodSharesus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse2122421224falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse423000423000falsefalsefalsexbrli:sharesItemTypesharesNumber of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 false1Stock Repurchased During Period, Shares5false 4us-gaap_TreasuryStockAcquiredAverageCostPerShareus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse14.3014.30USD$falsetruefalsenum:perShareItemTypedecimalTotal cost of shares repurchased divided by the total number of shares repurchased.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 false3Stock Repurchased During Period, Average Price per Share6false 4us-gaap_StockRepurchasedDuringPeriodValueus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse3000000.3USD$falsetruefalse2falsefalsefalse00falsefalsefalse3truefalsefalse60000006.0USD$falsetruefalsexbrli:monetaryItemTypemonetaryEquity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. 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