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Long-Term Debt and Financing Arrangements - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2011 Chassis
Line Of Credit Facility [Line Items] |  |  |  |  |
Maximum unsecured borrowing capacity |  |  |  | $ 50,000,000 |
Line of credit, expiration date |  |  | Dec. 31, 2018 |  |
Number of chassis leased | Chassis |  |  |  |  | 3,126
Chassis, lease agreement period (years) |  |  |  |  | 10 years
Capital lease interest paid | $ 600,000 | $ 700,000 | $ 800,000 |  |
Standby Letters of Credit [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Outstanding letters of credit | $ 11,800,000 |  |  |  |
Letters of credit expiration, years | 2017 |  |  |  |
Revolving Line of Credit Facility [Member] | Bank Revolving Line of Credit [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Unused and available borrowings under bank revolving line of credit | $ 38,200,000 | $ 41,800,000 |  |  |
Minimum [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Commitment fee charged on the unused line of credit |  |  |  | 0.10% |
Interest coverage ratio |  |  |  | 2.00% |
Maximum [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Commitment fee charged on the unused line of credit |  |  |  | 0.25% |
Total leverage ratio |  |  |  | 3.00% |
LIBOR rate [Member] | Minimum [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate under the Credit Agreement |  |  |  | 1.00% |
LIBOR rate [Member] | Maximum [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate under the Credit Agreement |  |  |  | 1.75% |
Prime Rate [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate under the Credit Agreement |  |  |  | 0.75% |

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- Definition The amount, during the lease term, of each minimum [capital] lease payment allocated to interest expense so as to produce a constant periodic rate of interest on the remaining balance of the capital lease obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 35 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6916424&loc=d3e43161-112731 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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