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Long-Term Debt and Financing Arrangements - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Jul. 01, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2011 Chassis
Line Of Credit Facility [Line Items] |  |  |  |  |
Number of chassis leased | Chassis |  |  |  |  | 3,126
Chassis, lease agreement period (years) |  |  |  |  | 10 years
Capital lease interest paid |  | $ 400,000 | $ 500,000 | $ 600,000 |
Letter of Credit [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Commitment fee on unused commitments | 2.00% |  |  |  |
Standby Letters of Credit [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Letters of credit expiration, year |  | 2019 |  |  |
Outstanding letters of credit |  | $ 27,000,000.0 |  |  |
Revolving Line of Credit Facility [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Borrowings under bank revolving line of credit |  |  | 45,000,000 |  |
Revolving Line of Credit Facility [Member] | Bank Revolving Line of Credit [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Borrowings under bank revolving line of credit |  | 0 |  |  |
Unused and available borrowings under bank revolving line of credit and credit agreement |  | $ 323,000,000.0 | $ 284,900,000 |  |
Credit Agreement [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Amount of credit agreement | $ 350,000,000 |  |  |  |
Credit agreement interest rate description |  | (i) LIBOR plus a specified margin based upon the Borrowers' total net leverage ratio (as defined in the Credit Agreement) (the "Total Net Leverage Ratio"), or (ii) the base rate (which is the highest of (a) the administrative agent's prime rate, (b) the federal funds rate plus 0.50% or (c) the sum of 1% plus one-month LIBOR) plus a specified margin based upon the Total Net Leverage Ratio. |  |  |
Commitment fee on unused commitments | 0.25% |  |  |  |
Credit Agreement [Member] | Federal Funds Rate [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate under the credit agreement | 0.50% |  |  |  |
Credit Agreement [Member] | LIBOR rate [Member] |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate under the credit agreement | 1.00% |  |  |  |
Description of variable rate basis | one-month LIBOR |  |  |  |
Credit Agreement [Member] | Eurodollar |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate under the credit agreement | 2.00% |  |  |  |
Credit Agreement [Member] | Base Rate |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate under the credit agreement | 1.00% |  |  |  |

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- Definition The number of units (items of property) under capital lease arrangements. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 35 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77915053&loc=d3e43161-112731 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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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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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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