Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

Acquisition of Businesses - Narrative (Details) € in Millions, £ in Millions			1 Months Ended											3 Months Ended	12 Months Ended
	Oct. 05, 2015 USD ($)	Oct. 05, 2015 EUR (€)	Jan. 31, 2015 USD ($)	Jan. 31, 2015 GBP (£)	Nov. 30, 2014 USD ($)	Nov. 30, 2014 EUR (€)	Oct. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2014 GBP (£)	Jul. 31, 2014 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2014 GBP (£)	Feb. 28, 2013 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2004 USD ($)	Nov. 30, 2014 EUR (€)	Feb. 28, 2013 GBP (£)
West Glacier, Apgar Village, and other operations
Business Acquisition [Line Items]
Purchase price										$ 16,544,000
Liability for working capital adjustment										300,000
Goodwill expected to be tax deductible, term of recognition																	15 years
Acquisition Related Costs																	$ 200,000
Intangible assets										$ 189,000
Weighted average useful life of intangibles										3 years 6 months
Revenue of Acquiree since Acquisition Date, Actual																$ 4,600,000
Earnings or Loss of Acquiree since Acquisition Date, Actual																1,500,000
Working capital adjustment										$ 320,000
Blitz Communication Group Limited
Business Acquisition [Line Items]
Purchase price								$ 24,416,000	£ 15.0
Acquisition Related Costs															$ 100,000	800,000
Intangible assets								$ 8,692,000
Weighted average useful life of intangibles								6 years 10 months 24 days	6 years 10 months 24 days
Revenue of Acquiree since Acquisition Date, Actual																10,100,000
Earnings or Loss of Acquiree since Acquisition Date, Actual																400,000
Acquisition adjustment for property and equipment															49,000
Acquisition adjustment for intangibles															16,000
Acquisition adjustment for accrued lease obligations															200,000
Acquisition adjustment for deferred taxes															200,000
Acquisition adjustment for goodwill															22,000
onPeak LLC
Business Acquisition [Line Items]
Purchase price							$ 42,950,000
Goodwill expected to be tax deductible, term of recognition							15 years
Acquisition Related Costs															200,000	500,000
Intangible assets							$ 14,100,000
Weighted average useful life of intangibles							9 years 10 months 24 days
Revenue of Acquiree since Acquisition Date, Actual																2,700,000
Earnings or Loss of Acquiree since Acquisition Date, Actual																700,000
Acquisition adjustment for intangibles															200,000
Acquisition adjustment for deferred taxes															1,400,000
Acquisition adjustment for goodwill															1,600,000
Escrow deposit							$ 4,100,000
Acquisition adjustment for other non-current assets															200,000
Acquisition adjustment for other liabilities															200,000
Goodwill deductible							9,900,000
Travel Planners, Inc
Business Acquisition [Line Items]
Purchase price							$ 33,674,000
Goodwill expected to be tax deductible, term of recognition							15 years
Acquisition Related Costs															200,000	500,000
Intangible assets							$ 14,400,000
Weighted average useful life of intangibles							9 years 9 months 18 days
Revenue of Acquiree since Acquisition Date, Actual																3,400,000
Earnings or Loss of Acquiree since Acquisition Date, Actual																500,000
Acquisition adjustment for intangibles															600,000
Escrow deposit							$ 8,800,000
Working capital adjustment							$ (279,000)
Additional payment of consideration														$ 900,000
Payable due to tax election															400,000
Acquisition adjustment for accrued liabilities															100,000
N200 Limited And Affiliates
Business Acquisition [Line Items]
Purchase price					$ 12,068,000	€ 9.7
Acquisition Related Costs															200,000	1,000,000
Intangible assets					$ 3,682,000
Weighted average useful life of intangibles					7 years 4 months 24 days	7 years 4 months 24 days
Revenue of Acquiree since Acquisition Date, Actual																400,000
Earnings or Loss of Acquiree since Acquisition Date, Actual																200,000
Acquisition adjustment for intangibles															100,000
Acquisition adjustment for deferred taxes															100,000
Acquisition adjustment for goodwill															400,000
Working capital adjustment					$ 458,000
Acquisition adjustment for accrued liabilities															100,000
Contingent liability \| €																		€ 1.0
Payment of contingent liability	$ 1,100,000	€ 1.0
Acquisition adjustment for contingent consideration															100,000
Acquisition adjustment for working capital adjustment															500,000
Acquisition adjustment for accounts receivable															15,000
Resource Creative Limited
Business Acquisition [Line Items]
Purchase price													$ 600,000
Contingent liability \| £																			£ 0.2
Payment of contingent liability			$ 100,000	£ 0.1							$ 200,000	£ 0.1
Blitz Communication, West Glacier, onPeak LLC, Travel Planners Inc, and N200 Limited and Affiliates [Member]
Business Acquisition [Line Items]
Acquisition Related Costs															$ 600,000	$ 3,000,000