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DEBT - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 13, 2018 | Mar. 31, 2015 | Dec. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017
Line of Credit Facility [Line Items] |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  | $ 68,400,000 |  | $ 68,400,000 | $ 68,500,000
Line Of Credit Facility Unused Capacity Commitment Fee Percentage |  |  | 0.40% |  |  |
Letter of Credit Annual Fee Percentage |  |  | 2.25% |  |  |
Line of Credit Facility, Initiation Date | Apr. 13, 2018 | Mar. 31, 2015 |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  | 3.42%
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 231,600,000 |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  | base rate plus 2% |  |  |
Long-term Debt |  |  | $ 292,084,000 |  | $ 293,073,000 | $ 165,000,000
Line of Credit Facility, Increase (Decrease), Net | $ 250,000,000 |  |  |  |  |
Debt Issuance Costs, Gross | $ 9,900,000 |  |  |  |  |
Letter Of Credit Annual Fee Percentage Reimbursement |  |  | 2.00% |  |  |
Term B Loan [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  | 5.52% |  |  |
Debt Instrument, Maturity Date | Apr. 13, 2025 |  |  |  |  |
Debt Instrument, Face Amount | $ 300,000,000 |  |  |  |  |
Debt Instrument, Periodic Payment, Principal | 750,000 |  |  |  |  |
Debt Issuance Costs, Gross | 7,100,000 |  |  |  |  |
Eurocurrency Rate [Member] | Term B Loan [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  | LIBOR-equivalent rate plus 3% |  |  |
Base Rate [Member] | Term B Loan [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.00% |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 300,000,000 |  |  |  |  |
Line of Credit Facility, Expiration Date | Apr. 13, 2023 | Mar. 31, 2020 |  |  |  |
Foreign Currency Borrowing Capacity | $ 200,000,000 | $ 400,000,000 |  |  |  |
Long-term Debt |  |  |  |  |  | $ 165,000,000
Debt Issuance Costs, Gross | 2,700,000 |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 1.75% |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 2.75% |  |  |
Revolving Credit Facility [Member] | Prime Rate [Member] | Minimum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 0.75% |  |  |
Revolving Credit Facility [Member] | Prime Rate [Member] | Maximum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 1.75% |  |  |
Letter of Credit [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 100,000,000 | $ 100,000,000 |  |  |  |
Letter Of Credit Title IV Disbursement, Amount |  |  |  | $ 68,400,000 |  |

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- Definition Represents the annual fee percentage on letter of credit. + References No definition available. + Details
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- Definition Represent the letter of credit annual fee percentage reimbursement. + 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 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 Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of the required periodic payments applied to principal. + 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 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. 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 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 Amount of increase (decrease) of the credit facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Date the credit facility first became available, in CCYY-MM-DD format. + 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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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)(3) -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(a)(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 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 4: 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 + Details
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