Recently Issued Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract]
Provision for taxes repatriation of foreign earnings	$ 2.9	$ 4.0

Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense

No definition available.

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Balance Type:	debit
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