Business Disposition - Additional Information (Detail) $ in Thousands		3 Months Ended	12 Months Ended
	Apr. 30, 2013 USD ($) Unit	Mar. 31, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 54,500
Proceed from sale of business, cash	52,500			$ 42,587
Sale of business non-cash consideration	$ 2,000
Period of free service provided	3 years
Proceeds from business after working capital adjustment	$ 3,300
Proceeds from sale of discontinued operations	51,200
Transaction costs from sale of business	2,400
Working capital adjustment	1,000
Proceeds from sale of business net of working capital adjustment and transaction cost	$ 47,800
Number of reporting units | Unit	3
Claims pursuant to post closing purchase price adjustment by GTT	$ 3,800
Due from GTT related to post closing purchase price adjustment	1,100
Gain (Loss) on sale of asset held for sale	28,800	$ (1,081)	$ (1,081)	28,791
Book value of asset held for sale	14,700
Purchase Price Allocation	4,300
Disposal group of business plus additional cash	1,000
Gain (Loss) on sale of the global data business	4,800			$ (4,837)
Americas
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of asset held for sale	43,500
Reduction in other assets	1,100
Gain (Loss) on sale of asset held for sale	1,100
EMEA and APAC
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of discontinued operations	4,300
Book value of asset held for sale	10,100
Disposal group including discontinued operation cash and cash equivalents	$ 1,000