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Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Instrument [Line Items] |  |
Revolving line of credit & Secured long-term debt | $ 330,784 | $ 292,074
Less current portion | (101,713) | (77,266)
Total long-term debt | 229,071 | 214,808
Revolving Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Revolving line of credit |  | 45,000
Secured Equipment Notes due in 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 11,658 | 13,586
Secured Equipment Notes due in 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 192,858 | 36,981
Secured Equipment Notes due in 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 24,092 | 30,301
Secured Equipment Notes due in 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 55,855 | 76,885
Secured Equipment Notes due in 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 32,904 | 50,737
Secured Equipment Notes due in 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | $ 13,417 | 36,178
Secured Equipment Notes due in 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt |  | $ 2,406

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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