Acquisition of land use rights

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[Line Items] for Operating Lease, Types [Table]

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Number of units of account associated with a transaction

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Area of a real estate property.

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 13
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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands, € in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2016 EUR (€)	Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2017 EUR (€)
Operating Lease, Types [Line Items]
Acquisition of land use rights		$ 48,494	$ 0	$ 0
Additions to property and equipment		219,889	173,915	131,504
2017		103,656
2018		103,561
2019		92,958
2020		79,340
2021		57,418
After 2021		150,738
Total		587,671
Office Leases
Operating Lease, Types [Line Items]
Operating leases, rent expense, net		77,300	64,800	57,200
Data Center Space, Leases
Operating Lease, Types [Line Items]
Operating leases, rent expense, net		$ 22,200	$ 21,600	$ 14,900
Norwalk, Connecticut \| Priceline.com and The Priceline Group Inc.
Operating Lease, Types [Line Items]
Area of real estate property \| ft²		90,000
Amsterdam, Netherlands \| Booking.com
Operating Lease, Types [Line Items]
Area of real estate property \| ft²		258,000
Stamford, Connecticut \| KAYAK
Operating Lease, Types [Line Items]
Area of real estate property \| ft²		18,000
Bangkok, Thailand \| agoda.com
Operating Lease, Types [Line Items]
Area of real estate property \| ft²		140,000
San Francisco, California \| OpenTable
Operating Lease, Types [Line Items]
Area of real estate property \| ft²		60,000
Manchester, England \| Rentalcars.com
Operating Lease, Types [Line Items]
Area of real estate property \| ft²		45,000
Headquarters \| Booking.com
Operating Lease, Types [Line Items]
Contractual obligation under Booking.com turnkey agreement \| €	€ 270
Units of account	2
Payments to acquire productive assets \| €	€ 48
Acquisition of land use rights	43	$ 45,300
Additions to property and equipment \| €	5
Headquarters \| Booking.com \| Ground Lease
Operating Lease, Types [Line Items]
Contractual obligation under Booking.com turnkey agreement \| €	€ 60
Term of ground lease (in years)	49 years
Headquarters \| Scenario, forecast \| Booking.com
Operating Lease, Types [Line Items]
Contractual obligation under Booking.com turnkey agreement \| €					€ 34