Goodwill and Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2018	$ 1,697,955
Foreign currency translation	(806)
Acquisition adjustments	183
Balance at June 30, 2019	1,697,332
FMT
Goodwill [Roll Forward]
Balance at December 31, 2018	581,041
Foreign currency translation	(610)
Acquisition adjustments	0
Balance at June 30, 2019	580,431
HST
Goodwill [Roll Forward]
Balance at December 31, 2018	745,357
Foreign currency translation	637
Acquisition adjustments	183
Balance at June 30, 2019	746,177
FSDP
Goodwill [Roll Forward]
Balance at December 31, 2018	371,557
Foreign currency translation	(833)
Acquisition adjustments	0
Balance at June 30, 2019	$ 370,724

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 foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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