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Debt - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 12, 2016 | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017
Line of Credit Facility [Line Items] |  |  |  |
Company indebtedness |  | $ 0 | $ 0 |
Remaining available borrowing capacity |  | 200,000,000 | $ 200,000,000 |
Third Amended and Restated Credit Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Termination date of the Credit Agreement |  |  | Jan. 12, 2021 |
Third Amended and Restated Credit Agreement [Member] | Federal Funds Rate [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Interest rate | 0.50% |  |  |
Third Amended and Restated Credit Agreement [Member] | Eurodollar Rate Loans [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Interest rate | 1.00% |  |  |
Second Amended and Restated Credit Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility covenant terms |  |  |  | The material financial covenants and restrictions do not permit the Company’s fixed charge coverage ratio to be less than 1.5 to 1.0 and do not permit the Company’s consolidated debt to consolidated EBITDA ratio to exceed 3.0 to 1.0, measured as of the end of each fiscal quarter (and in the case of Consolidated EBITDA, for the four-quarter period ending on such date).
Revolver Loans Portion Effective January 1 through June 30 [Member] | Third Amended and Restated Credit Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Revolving loans in a collective maximum principal amount |  | 250,000,000 | $ 250,000,000 |
Revolver Loans Portion Effective July 1 through December 31 [Member] | Third Amended and Restated Credit Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Revolving loans in a collective maximum principal amount |  | $ 200,000,000 | 200,000,000 |
Revolving Credit Facility [Member] | Second Amended and Restated Credit Agreement [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Fixed charge coverage ratio as per credit agreement |  | 1.5 |  |
Revolving Credit Facility [Member] | Second Amended and Restated Credit Agreement [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Consolidated debt to earnings before interest taxes depreciation amortization ratio as per the credit agreement |  | 3.0 |  |
Revolving Credit Facility [Member] | Letter of Credit Facility Sublimit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Revolving loans in a collective maximum principal amount |  | $ 15,000,000 | 15,000,000 |
Revolving Credit Facility [Member] | Swing Advance Loan Sublimit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Revolving loans in a collective maximum principal amount |  | $ 5,000,000 | $ 5,000,000 |

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- Definition To remain in compliance with the financial covenants in the Second Amended Credit Agreement, the Company must maintain a consolidated debt to EBITDA ratio as set forth in the agreement. + References No definition available. + Details
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- Definition To remain in compliance with the financial covenants in the Second Amended Credit Agreement, the Company must maintain a certain fixed charge coverage ratio as set forth in the agreement. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: 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 Reference 3: 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 4: 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 + Details
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