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Leases - Additional Information (Detail) $ in Thousands		12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) Facility
Leases Disclosure [Line Items]
Net proceeds from sale and leaseback agreement		$ 800		$ 14,244
Rent expense		3,700	$ 4,200	$ 4,500
Financing Transaction
Leases Disclosure [Line Items]
Number of facility for sale | Facility				1
Gross proceeds from sale and leaseback agreement				$ 5,000
Sale leaseback transaction costs				300
Net proceeds from sale and leaseback agreement				$ 4,700
Initial lease agreement period				13 years
Amended lease agreement term				2031-06
Weighted average effective interest rate of sale leaseback financing liability				4.53%
Sale leaseback transaction, net carrying value		$ 10,200	$ 11,000
Capital Leases [Member]
Leases Disclosure [Line Items]
Number of facility for sale | Facility				2
Gross proceeds from sale and leaseback agreement				$ 9,300
Sale leaseback transaction costs				500
Net proceeds from sale and leaseback agreement				$ 8,800
Lease agreement period				13 years
Sale Leaseback Transaction Lease Amendment Extended Term	2030-08
Gain on sale of facility				$ 4,400
Capital lease obligations				$ 8,700
Capital Leases [Member] | Maximum [Member]
Leases Disclosure [Line Items]
Capital lease weighted average interest rates				4.67%
Capital Leases [Member] | Minimum [Member]
Leases Disclosure [Line Items]
Capital lease weighted average interest rates				4.26%

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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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