Pension Plans and Other Post Retirement Benefits - Schedule of the Change in Benefit Obligation (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation—beginning of period			$ 57,106	$ 61,520	$ 61,520
Service cost	$ 470	$ 409	930	1,069	1,913
Interest cost	332	244	658	533	1,059
Benefits paid			(822)		(1,329)
Actuarial (gain) loss			400		(6,984)
Foreign exchange (gain) loss			2,423		927
Benefit obligation—end of period	60,695	57,106	60,695	57,106	57,106
Less: Current portion	(1,727)		(1,727)		(1,590)
Non-current portion of benefit obligation	58,968		58,968		55,516
CDT
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation—beginning of period			28,881	29,450	29,450
Service cost	125	112	249	232	467
Interest cost	151	109	301	226	456
Benefits paid			(280)		(469)
Actuarial (gain) loss			352		(1,708)
Foreign exchange (gain) loss			1,322		685
Benefit obligation—end of period	30,825	28,881	30,825	28,881	28,881
Less: Current portion	(642)		(642)		(583)
Non-current portion of benefit obligation	30,183		30,183		28,298
GXS Germany
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation—beginning of period			23,730	24,729	24,729
Service cost	117	94	234	195	395
Interest cost	122	90	243	186	377
Benefits paid			(482)		(807)
Actuarial (gain) loss			492		(1,548)
Foreign exchange (gain) loss			1,087		584
Benefit obligation—end of period	25,304	23,730	25,304	23,730	23,730
Less: Current portion	(983)		(983)		(926)
Non-current portion of benefit obligation	24,321		24,321		22,804
GXS Philippines
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation—beginning of period			4,495	7,341	7,341
Service cost	228	203	447	642	1,051
Interest cost	59	45	114	121	226
Benefits paid			(60)		(53)
Actuarial (gain) loss			(444)		(3,728)
Foreign exchange (gain) loss			14		(342)
Benefit obligation—end of period	4,566	$ 4,495	4,566	$ 4,495	4,495
Less: Current portion	(102)		(102)		(81)
Non-current portion of benefit obligation	$ 4,464		$ 4,464		$ 4,414