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DEBT - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2021 | Jan. 31, 2019 | Mar. 03, 2015 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2020 | Jan. 17, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  | $ 4,600,000 |  |  |  |
Principal payment |  |  |  |  |  | $ 12,500,000 | $ 7,500,000 |  |
Revolving credit facility | Amended Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayment of outstanding balance |  |  |  |  | 354,500,000 |  |  |  |
Issuance fees per annum |  |  | 0.125% |  |  |  |  |  |
Revolving credit facility | Amended Credit Agreement | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage of unused borrowings |  |  | 0.20% |  |  |  |  |  |
Revolving credit facility | Amended Credit Agreement | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage of unused borrowings |  |  | 0.35% |  |  |  |  |  |
Revolving credit facility | Amended Credit Agreement | Base rate | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 0.50% |  |  |  |  |  |
Revolving credit facility | Amended Credit Agreement | Base rate | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 1.25% |  |  |  |  |  |
Revolving credit facility | Amended Credit Agreement | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 1.00% |  |  |  |  |  |
Revolving credit facility | Amended Credit Agreement | LIBOR | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 1.50% |  |  |  |  |  |
Revolving credit facility | Amended Credit Agreement | LIBOR | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 2.25% |  |  |  |  |  |
Revolving credit facility | Amended Credit Agreement | Federal funds rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 0.50% |  |  |  |  |  |
Revolving credit facility | Amended Credit Agreement | Applicable interest rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt basis spread over applicable interest rate |  |  | 2.00% |  |  |  |  |  |
Revolving credit facility | Second Amended & Restated Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility |  |  |  | $ 400,000,000 |  | 400,000,000 |  |  | $ 400,000,000
Additional borrowing capacity |  |  |  |  |  |  |  |  | 300,000,000
Repayment of outstanding balance |  |  |  |  | $ 68,900,000 |  |  |  |
Maximum leverage ratio |  |  | 3.25 |  |  |  |  |  |
Minimum liquidity to satisfy covenant terms |  |  | $ 250,000,000.0 |  |  |  |  |  |
Availability of revolving credit facility to satisfy covenant term |  |  | $ 50,000,000.0 |  |  |  |  |  |
Outstanding borrowing |  |  |  | 0 |  | 0 |  |  |
Term loan facility | Amended Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percentage of principal due quarterly |  |  | 1.25% |  |  |  |  |  |
Term loan facility | Second Amended & Restated Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility |  |  |  |  |  |  |  |  | $ 500,000,000
Repayment of outstanding balance |  |  |  | 11,300,000 |  | 25,800,000 |  |  |
Principal payment |  |  |  | 6,200,000 |  | 12,500,000 |  |  |
Interest payment |  |  |  | $ 5,100,000 |  | $ 13,300,000 |  |  |
Interest rate percentage on term loan |  |  |  |  |  | 4.27% |  |  |
Letters of credit | Amended Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility |  |  | $ 10,000,000.0 |  |  |  |  |  |
Letters of credit | Amended Credit Agreement | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage of unused borrowings |  |  | 1.50% |  |  |  |  |  |
Letters of credit | Amended Credit Agreement | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage of unused borrowings |  |  | 2.25% |  |  |  |  |  |
Sublimit for swingline loan advances | Amended Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility |  |  | $ 25,000,000.0 |  |  |  |  |  |
Sublimit for swingline loan advances | Amended Credit Agreement | Base rate | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 0.50% |  |  |  |  |  |
Sublimit for swingline loan advances | Amended Credit Agreement | Base rate | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 1.25% |  |  |  |  |  |
Forecast | Term loan facility | Amended Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percentage of principal due quarterly | 2.50% |  |  |  |  |  |  | 1.875% |
Subsequent event | Term loan facility | Second Amended & Restated Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate percentage on term loan |  | 4.25% |  |  |  |  |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + 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 The effective interest rate during the reporting period. + 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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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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