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Related Party Transaction - Schedule of Carrying Value of Finance Lease Obligations to Related Parties (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule Of Related Party [Line Items]
Finance Lease Obligations with subsidiary of The Modern Group, Ltd	$ 4,665
Less: Amounts due within one year	(4,662)
Total Long Term Finance Lease Obligations to Related Parties	3
Less: Amounts due within one year		$ (3,879)
Total Long Term Finance Lease Obligations to Related Parties		3,367
The Modern Group Ltd
Schedule Of Related Party [Line Items]
Finance Lease Obligations with subsidiary of The Modern Group, Ltd	$ 4,665
Finance Lease Obligations with subsidiary of The Modern Group, Ltd		$ 7,246

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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