Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460

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Balance Type:	debit
Period Type:	duration

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

+ Details

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

- Definition

Business acquisition, goodwill, expected tax deductible amount, period of recognition.

+ References

No definition available.

+ Details

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- Definition

Estimated fair value of redeemable non-controlling interest.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Payments for contingent consideration.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Payments to acquire businesses gross including earnout payment.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Details

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Acquisition of Businesses - Narrative (Details) € in Millions, $ in Millions										1 Months Ended			12 Months Ended
	Nov. 03, 2017 USD ($)	Nov. 03, 2017 EUR (€)	Dec. 29, 2016	Dec. 29, 2016 USD ($)	Dec. 29, 2016 CAD ($)	Aug. 11, 2016 USD ($)	Mar. 11, 2016 USD ($)	Jan. 04, 2016 USD ($)	Jan. 04, 2016 CAD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CAD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Purchase price allocation adjustment to goodwill													$ (73,000)
Maligne Canyon Restaurant
Business Acquisition [Line Items]
Purchase price										$ 4,600,000	$ 6.0
Acquisition related costs													24,000
Business acquisition date										Mar. 31, 2018	Mar. 31, 2018
Poken Event Engagement Technology
Business Acquisition [Line Items]
Purchase price												$ 1,700,000
Acquisition related costs														$ 300,000
Esja Attractions ehf.
Business Acquisition [Line Items]
Purchase price	$ 9,500,000	€ 8.2
Business acquisition date	Nov. 03, 2017	Nov. 03, 2017
Percentage of controlling interest acquired	54.50%
Estimated fair value of non-controlling interest	$ 6,700,000
Purchase price allocation adjustment to goodwill													100,000
Esja Attractions ehf. \| Start-up Costs
Business Acquisition [Line Items]
Operating income (losses)													(900,000)	(100,000)
Esja Attractions ehf. \| Corporate Activities
Business Acquisition [Line Items]
Acquisition related costs													$ 100,000	100,000
Maligne Tours Ltd
Business Acquisition [Line Items]
Purchase price								$ 14,962,000	$ 20.9
Acquisition related costs														100,000	$ 100,000	$ 200,000
Business acquisition date								Jan. 04, 2016	Jan. 04, 2016
CATC Alaska Tourism Corporation
Business Acquisition [Line Items]
Purchase price							$ 45,000,000
Acquisition related costs														100,000	100,000	$ 600,000
Business acquisition date							Mar. 11, 2016
Percentage of controlling interest acquired							100.00%
ON Event Services LLC
Business Acquisition [Line Items]
Purchase price						$ 87,000,000
Acquisition related costs														100,000	900,000
Business acquisition date						Aug. 11, 2016
Estimated fair value of Earnout						$ 540,000									0
Goodwill expected to be tax deductible, term of recognition						15 years
ON Event Services LLC \| Maximum
Business Acquisition [Line Items]
Aggregate purchase price						$ 92,500,000
Contingent liability						$ 5,500,000
FlyOver Canada
Business Acquisition [Line Items]
Purchase price				$ 50,920,000	$ 68.8
Acquisition related costs														$ 100,000	$ 500,000
Business acquisition date			Dec. 29, 2016