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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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- Definition The amount of the gain recorded in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller to be recognized in future periods. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77913853&loc=d3e49567-112750 + Details
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