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NOTES PAYABLE, REVOLVING CREDIT FACILITY AND CAPITAL LEASES - Narrative (Details) |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 35 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | Aug. 22, 2017 USD ($) | Feb. 02, 2017 USD ($) | Jul. 01, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2017 | Dec. 31, 2018 USD ($) | Aug. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Deferred financing costs, net of accumulated amortization |  |  |  |  |  |  | $ 1,400,000 |  | $ 1,900,000
Debt instrument, leverage ratio |  | 4.00 |  |  |  |  |  |  |
Amendment No. 4 First Lien Credit Agreement | Eurodollar |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 3.25% |  |  |  |  |  |
First Lien Term Loans | Eurodollar |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 3.75% |  |  |  |  |
Basis spread, increase (decrease) |  |  |  | 50.00% |  |  |  |  |
Restated Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities, increase (decrease) |  |  |  |  |  |  |  | $ 48,100,000 |
Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities available |  |  |  |  | $ 50,000,000.0 |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total Carrying Value |  |  |  |  |  |  | 631,329,000 |  |
Debt, unamortized discount |  |  |  |  |  |  | 15,112,000 |  |
Face Value |  |  |  |  |  |  | 646,441,000 |  |
Term Loan | First Lien Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt periodic payment |  |  |  |  |  |  | 6,100,000 |  |
Term Loan | Amendment No. 5 First Lien Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, increase to credit facility, maximum |  | $ 100,000,000.0 |  |  |  |  |  |  |
Term Loan | First Lien Term Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total Carrying Value |  |  |  |  |  |  | 572,079,000 |  |
Debt, unamortized discount |  |  |  |  |  |  | 15,112,000 |  |
Debt discount |  |  |  |  |  |  | 15,112,000 |  | $ 18,470,000
Face Value |  |  |  | $ 485,000,000 |  |  | 587,191,000 |  |
Term Loan | First Lien Term Loans | Eurodollar |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 3.75% |  |  |  |  |
Basis spread, floor |  |  |  | 1.00% |  |  |  |  |
Term Loan | First Lien Term Loans | Base Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.75% |  |  |  |  |
Term Loan | Second Lien Term Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face Value |  |  |  |  |  |  | 180,000,000 |  |
Principal payment |  |  |  | $ 12,000,000 |  |  |  |  |
General corporate expense |  |  |  | 10,000,000 |  |  |  |  |
Term Loan | Restated Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities available | $ 60,000,000.0 |  |  |  |  |  |  | 60,000,000.0 |
Total Carrying Value |  |  |  |  |  |  | 59,250,000 |  |
Debt, unamortized discount |  |  |  |  |  |  | 0 |  |
Face Value |  |  |  |  |  |  | $ 59,250,000 |  |
Debt periodic payment | $ 750,000 |  |  |  |  |  |  |  |
Credit facilities, increase (decrease) |  |  |  |  |  |  |  | 28,100,000 |
Debt periodic payment, percent of total amount | 5.00% |  |  |  |  |  |  |  |
Debt periodic payment, amortization increase | $ 375,000 |  |  |  |  |  |  | 375,000 |
Term Loan | Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities available | 40,000,000.0 |  |  |  |  |  |  | 40,000,000.0 |
Debt periodic payment | $ 500,000 |  |  |  |  |  |  |  |
Debt periodic payment, percent of total amount | 5.00% |  |  |  |  |  |  |  |
Debt periodic payment, amortization increase | $ 250,000 |  |  |  |  |  |  | 250,000 |
Revolving Credit Facility | Line of Credit | First Lien Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities available |  |  |  | $ 117,500,000.0 |  |  |  |  |
Fronting fee |  |  |  | 0.25% |  |  |  |  |
Commitment fee |  |  |  | 0.50% |  |  |  |  |
Interest rate at end of period |  |  |  |  |  |  | 8.25% |  |
Credit facility, borrowings available |  |  |  |  |  |  | $ 83,200,000 |  |
Revolving Credit Facility | Line of Credit | First Lien Credit Agreement | Eurodollar | ≤ 3.50x |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 3.25% |  |  |  |  |
Revolving Credit Facility | Line of Credit | First Lien Credit Agreement | Eurodollar | 4.00x but ≤ 5.50x |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 3.75% |  |  |  |  |
Revolving Credit Facility | Line of Credit | First Lien Credit Agreement | Base Rate | ≤ 3.50x |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.25% |  |  |  |  |
Revolving Credit Facility | Line of Credit | First Lien Credit Agreement | Base Rate | 4.00x but ≤ 5.50x |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.75% |  |  |  |  |
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities available |  |  |  |  |  |  | $ 170,000,000.0 |  |
Periodic payment, principal |  | 8,300,000 |  |  |  |  |  |  |
Issuance costs |  | 4,700,000 |  |  |  |  |  |  |
Debt discount |  | 4,100,000 |  |  |  |  |  |  |
Deferred financing costs |  | 350,000 |  |  |  |  |  |  |
Debt issuance expense |  | $ 235,000 |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement | Eurodollar |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 3.75% |  |
Effective interest rate |  |  |  |  |  |  | 2.44% |  |
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement | Eurodollar | ≤ 3.50x |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.25% |  |  |  | 3.25% |  |  |
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement | Eurodollar | 4.00x but ≤ 5.50x |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.75% |  |  |  | 3.75% |  |  |
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement | Base Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 2.75% |  |
Effective interest rate |  |  |  |  |  |  | 5.50% |  |
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement | Base Rate | ≤ 3.50x |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.25% |  |  |  | 2.25% |  |  |
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement | Base Rate | 4.00x but ≤ 5.50x |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.75% |  |  |  | 2.75% |  |  |
Revolving Credit Facility | Line of Credit | Amendment No. 4 First Lien Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Periodic payment, principal |  |  | $ 6,100,000 |  |  |  |  |  |
Debt discount |  |  |  |  |  |  | $ 543,000 |  |
Revolving Credit Facility | Line of Credit | Restated Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities available | $ 30,000,000.0 |  |  |  |  |  |  | 30,000,000.0 |
Fronting fee | 2.75% |  |  |  |  |  |  |  |
Commitment fee | 0.45% |  |  |  |  |  |  |  |
Credit facilities, increase (decrease) |  |  |  |  |  |  |  | $ 20,000,000.0 |
Revolving Credit Facility | Line of Credit | Restated Agreement | Eurodollar |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.75% |  |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Restated Agreement | Eurodollar | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.75% |  |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Restated Agreement | Eurodollar | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Restated Agreement | Base Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Restated Agreement | Base Rate | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Restated Agreement | Base Rate | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities available |  |  |  |  | $ 10,000,000.0 |  |  |  |
Fronting fee |  |  |  |  | 3.00% |  |  |  |
Commitment fee |  |  |  |  | 0.45% |  |  |  |
Revolving Credit Facility | Line of Credit | Agreement | Eurodollar |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 3.00% |  |  |  |
Revolving Credit Facility | Line of Credit | Agreement | Eurodollar | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 3.00% |  |  |  |
Revolving Credit Facility | Line of Credit | Agreement | Eurodollar | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.75% |  |  |  |
Revolving Credit Facility | Line of Credit | Agreement | Base Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 2.00% |  |  |  |
Revolving Credit Facility | Line of Credit | Agreement | Base Rate | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 2.00% |  |  |  |
Revolving Credit Facility | Line of Credit | Agreement | Base Rate | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 0.75% |  |  |  |
Revolving Credit Facility | Line of Credit | Barclays |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Deferred financing costs, net of accumulated amortization |  |  |  |  |  |  | 1,400,000 |  |
Revolving Credit Facility | Line of Credit | Barclays | First Lien Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities available |  |  |  |  |  |  | 117,500,000 |  |
Total credit facilities outstanding |  |  |  |  |  |  | 28,000,000 |  |
Revolving Credit Facility | Line of Credit | SunTrust |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facilities available |  |  |  |  |  |  | $ 30,000,000 |  |

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- Definition Represents the charge against earnings during the period for commitment fees and debt issuance expenses. + References Reference 1: 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 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 Amount, after 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -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 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 aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -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 The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + 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 The effective interest rate at the end of 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 Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 debt initially having maturity due after one year or beyond the normal 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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