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Fair Value Measurement - Additional Information (Detail) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value Measurement [Line Items] |  |
Fair value of fixed-rate borrowings less than historical carrying value | $ 3,600,000 | $ 2,400,000
Fixed-rate borrowings, carrying value | 303,500,000 | 247,100,000
Restricted investments | 22,200,000 | $ 20,100,000
Estenson Logistics, LLC [Member] |  |
Fair Value Measurement [Line Items] |  |
Fair value of contingent consideration | $ 0 |

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