Goodwill and Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2017	$ 1,704,158
Foreign currency translation	(14,739)
Acquisition adjustments	1,152
Balance at June 30, 2018	1,690,571
FMT
Goodwill [Roll Forward]
Balance at December 31, 2017	586,064
Foreign currency translation	(3,677)
Acquisition adjustments	0
Balance at June 30, 2018	582,387
HST
Goodwill [Roll Forward]
Balance at December 31, 2017	740,032
Foreign currency translation	(6,509)
Acquisition adjustments	1,152
Balance at June 30, 2018	734,675
ESDP
Goodwill [Roll Forward]
Balance at December 31, 2017	378,062
Foreign currency translation	(4,553)
Acquisition adjustments	0
Balance at June 30, 2018	$ 373,509

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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