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Long-term Debt - Schedule of Maturities of Debt (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Notes payable maturity date | 2025-03 |
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable Interest rate | 4.00% |
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable Interest rate | 5.00% |
Term Loan Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ 4,940 | $ 5,146
Vehicle and Equipment [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable maturity date | 2023-03 |
Vehicle and Equipment [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable Interest rate | 2.00% |
Vehicle and Equipment [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable Interest rate | 4.50% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 + Details
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