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Commitments - Additional Information (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 USD ($)
Commitments Disclosure [Line Items] |
Unrecorded Unconditional Purchase Obligation | $ 90
Building [Member] |
Commitments Disclosure [Line Items] |
Lease Expiration Date | Dec. 31, 2032

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- Definition [Line Items] for Commitments Disclosure [Table] + References No definition available. + Details
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Namespace Prefix: | expd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |