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Long-Term Debt (Amended and Restated Senior Credit Facility) - Additional Information (Detail) - USD ($) $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 21, 2020 | Feb. 27, 2019 | Feb. 06, 2019 | Dec. 15, 2015 | Dec. 31, 2012 | Apr. 01, 2011 | May 31, 2020 | Apr. 30, 2020 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2017 | Dec. 15, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings on revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 | $ 76,573 |  |
Consolidated funded debt, unrestricted and unencumbered cash to consolidated EBITDA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000
Eurodollar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |
Base Rate Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |
Tranche B-3 Facility [Member] | Eurodollar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |
Tranche B-3 Facility [Member] | Base Rate Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |
Tranche B-3 Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |
Amended and Restated Senior Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date entered into an agreement |  |  |  |  | Dec. 31, 2012 | Apr. 01, 2011 |  |  |  |  |  |  |  |  |  |
Amount available under revolving line of credit |  |  |  |  |  |  |  |  |  |  |  |  | $ 485,900 |  |  |
Borrowings on revolving credit facility |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |
Repayment of revolving credit facility |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  | Nov. 30, 2021 |  |  |  |  |  |  |  |  |  |  | Feb. 11, 2022 |
Term loan repayments |  |  |  |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |
Amended and Restated Senior Credit Facility [Member] | Eurodollar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |
Amended and Restated Senior Credit Facility [Member] | Base Rate Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |
Amended and Restated Senior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |
Amended and Restated Senior Credit Facility [Member] | Tranche B-3 Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan repayments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 447,300 |
Amended and Restated Senior Credit Facility [Member] | Tranche B-4 Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 16, 2023 |  |  |
Term loan repayments |  |  |  |  |  |  |  |  |  |  |  |  | $ 854,400 |  |  |
Amended and Restated Senior Credit Facility [Member] | Tranche B-4 Facilities [Member] | Eurodollar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |
Amended and Restated Senior Credit Facility [Member] | Tranche B-4 Facilities [Member] | Base Rate Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |
Amended and Restated Senior Credit Facility [Member] | Tranche B-4 Facilities [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |
Amended and Restated Senior Credit Facility [Member] | December 31, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan principal repayments |  |  |  | $ 7,100 |  |  |  |  |  |  |  |  |  |  |  |
Term loan repayments |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |
Amended and Restated Senior Credit Facility [Member] | March 31, 2021 to September 30, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan principal repayments |  |  |  | $ 9,500 |  |  |  |  |  |  |  |  |  |  |  |
Amended and Restated Senior Credit Facility [Member] | March 31, 2019 to December 31, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan repayments |  |  |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |
Amended and Restated Senior Credit Facility [Member] | September 30, 2015 to December 31, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan repayments |  |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |  |
Amended and Restated Senior Credit Facility [Member] | Standby Letters Of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standby letters of credit outstanding |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,100 |  |  |
Amended and Restated Senior Credit Facility [Member] | TLB Facility Due on February 16, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan repayments |  |  |  |  |  |  |  |  |  |  |  | $ 2,300 |  |  |  |
Amended and Restated Senior Credit Facility [Member] | TLB Facility Due on February 16, 2023 [Member] | December 31, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan repayments |  |  |  |  |  |  |  |  | $ 2,300 |  |  |  |  |  |  |
Amended and Restated Senior Credit Facility [Member] | TLB Facility Due on February 16, 2023 [Member] | March 31, 2019 to December 31, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan repayments |  |  |  |  |  |  |  |  |  |  | $ 2,300 |  |  |  |  |
Amended and Restated Senior Credit Facility [Member] | TLB Facility Due on February 16, 2023 [Member] | September 30, 2015 to December 31, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan repayments |  |  |  |  |  |  |  |  |  | $ 2,300 |  |  |  |  |  |
Eleventh Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date entered into an agreement |  |  | Feb. 06, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Twelfth Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date entered into an agreement |  | Feb. 27, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thirteenth Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date entered into an agreement | Apr. 21, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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=120391452&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=120398452&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=120400017&loc=d3e572229-122910 + Details
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