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Leases, User Charges and Commitments - Summary of Lease Costs (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Amortization of finance right-of-use assets	$ 589
Interest on finance lease liabilities	74
Finance lease cost	663
Operating lease cost	2,606
Short-term lease cost	26
Sublease income	(158)
Total lease cost	$ 3,137

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Finance lease cost.

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- Definition

Amount of interest expense on finance lease liability.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of sublease income excluding finance and operating lease expense.

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