Business Disposition - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Apr. 30, 2013	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 54,500,000
Proceed from sale of business, cash	52,500,000					9,698,000
Sale of business non-cash consideration	2,000,000
Period of free service provided	3 years
Proceeds from business after working capital adjustment	3,300,000
Proceeds from sale of discontinued operations	51,200,000
Transaction costs from sale of business	2,400,000
Working capital adjustment	1,000,000
Proceeds from sale of asset held for sale	37,900,000
Proceeds from sale of business net of working capital adjustment and transaction cost	47,800,000
Claims pursuant to post closing purchase price adjustment by GTT	3,800,000
Due from GTT related to post closing purchase price adjustment	1,100,000
Reduction in other assets					1,340,000	(1,340,000)
Gain (Loss) on sale of asset held for sale	23,200,000	5,600,000		28,800,000	(1,081,000)	23,171,000
Book value of asset held for sale	14,700,000
Gain (Loss) on sale of the global data business	800,000	(5,600,000)	(11,000)	(4,800,000)		783,000
Disposal group including discontinued operation cash and cash equivalents	1,000,000
Purchase Price Allocation	4,300,000
Disposal group of business plus additional cash	1,000,000
Americas
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of asset held for sale	43,500,000
Reduction in other assets					1,100,000
Gain (Loss) on sale of asset held for sale					1,100,000
EMEA and APAC
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of discontinued operations	4,300,000
Book value of asset held for sale	$ 10,100,000