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Shareholders' Equity - Company's Repurchasing Activity by Repurchase Plan (Detail) (USD $)
 252 Months Ended
Dec. 31, 2014
Non-Discretionary Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Cumulative shares repurchased 27,433,977us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= expd_NonDiscretionaryPlanMember
Average price per share $ 25.50expd_AveragePricePerShare
/ us-gaap_ShareRepurchaseProgramAxis
= expd_NonDiscretionaryPlanMember
Discretionary Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Cumulative shares repurchased 44,129,166us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= expd_DiscretionaryPlanMember
Average price per share $ 38.12expd_AveragePricePerShare
/ us-gaap_ShareRepurchaseProgramAxis
= expd_DiscretionaryPlanMember