Represents amortization of landlord funded tenant improvements.

No definition available.

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- Definition

Represents incurred in a cloud computing arrangement. implementation costs

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents number of customers.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents amount of original maturity period of cash, cash equivalents and investments.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- Definition

Represents expiration period of stock rotation rights.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
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- Definition

Line item represents accounting policies.

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
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Balance Type:	debit
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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Balance Type:	na
Period Type:	instant

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The total expense recognized in the period for promotion, public relations, and brand or product advertising.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

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Summary of Significant Accounting Policies (Detail Textuals) Segment in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Percentage of outstanding voting shares	50.00%
Original maturity period of cash, cash equivalents and investments	Three months or less
Expiration period of stock rotation rights	270 days
Shipping and handling costs	$ 4,823,781	$ 4,948,153	$ 5,121,501
Amortization of landlord funded tenant improvements	14,000	12,100	6,600
Advertising and sales promotion expense	23,500	$ 17,500	19,600
Implementation cost	$ 11,900
Accounts receivable
Summary Of Significant Accounting Policies [Line Items]
Number of customer \| Segment	2	2
Customer one \| Accounts receivable
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	13.00%	19.00%
Customer two \| Accounts receivable
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	12.00%	14.00%
Minimum
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible assets, useful life	1 year
Maximum
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible assets, useful life	13 years
Shipping and handling costs
Summary Of Significant Accounting Policies [Line Items]
Shipping and handling costs	$ 13,200	$ 12,600	$ 4,300
Building and Building Improvements \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Building and Building Improvements \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	40 years
Machinery and equipment \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	2 years
Machinery and equipment \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Internal-use computer software \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	2 years
Internal-use computer software \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	7 years