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Debt Instrument, Additional Term

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Debt Instrument, Basis Spread on Variable Rate Period Increase (Decrease)

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Decrease in Borrowing Capacity

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- Definition

Description of the interest rate for the amounts borrowed under the intercompany term loan facility.

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- Definition

Interest coverage ratio is a ratio used to determine how easily a company can pay interest on outstanding debt. The interest coverage ratio is calculated by dividing a company's earnings before interest, taxes, depreciation and amortization (EBITDA) of one period by the company's interest expenses of the same period.

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Interest Coverage Ratio, Actual

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- Definition

Number of Tranches of Debt

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- Definition

Amount of amortization expense attributable to debt issuance costs.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

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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.

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No definition available.

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Amount of the required periodic payments including both interest and principal payments.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

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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.

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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.

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No definition available.

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Fair value of the amount outstanding under the credit facility.

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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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.

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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.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Indebtedness divided by net capital.

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No definition available.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Debt - Additional Information (Detail)					3 Months Ended		9 Months Ended		12 Months Ended
Debt - Additional Information (Detail)	Jun. 30, 2017 USD ($)	Jan. 04, 2017 USD ($)	Nov. 30, 2016 USD ($)	Mar. 17, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Jun. 30, 2016	Jul. 02, 2015 USD ($)	Apr. 04, 2014 USD ($)	Aug. 20, 2013 USD ($) tranch
Debt Instrument [Line Items]
Intercompany revolving credit facility, amount outstanding					$ 0		$ 0
Net leverage ratio					2.40		2.40
Interest coverage ratio					3.14		3.14
Proceeds from revolving credit facility							$ 85,500,000	$ 27,000,000
Write off of deferred debt issuance cost			$ 7,600,000
Interest coverage ratio, actual					3.14		3.14
Amortization of debt issuance costs							$ 1,693,000	$ 3,149,000
Revolving Credit Facility Amendment Six
Debt Instrument [Line Items]
Consent fee percentage		0.25%
Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity					$ 35,000,000		$ 35,000,000								$ 40,000,000
Rate of commitment fee							1.40%
Net leverage ratio					5.50	1.75	5.50	1.75	1.75			1.75	1.75
Interest coverage ratio					1.75		1.75		5.00				5.00
Debt instrument, term							1 year
Debt instrument, additional term							1 year
Decrease in borrowing capacity	$ 2,500,000
Amortization of debt issuance costs					$ 28,000	$ 8,000	$ 86,000	$ 120,000
Revolving Credit Facility \| Scenario Forecast
Debt Instrument [Line Items]
Net leverage ratio											5.25
Interest coverage ratio											2.25
Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Debt interest rate, applicable margin							4.75%
Revolving Credit Facility \| Alternate Base Rate
Debt Instrument [Line Items]
Debt interest rate, applicable margin							3.75%
Line of credit facility interest rate description							Outstanding principal amounts under the Revolving Credit Facility bear interest at OCIB’s option at either LIBOR plus a margin of 4.75% or a base rate plus a margin of 3.75%.
Revolving Credit Facility \| Revolving Credit Facility Amendment Five
Debt Instrument [Line Items]
Borrowing capacity						$ 20,000,000		$ 20,000,000
Rate of commitment fee				1.40%
Net leverage ratio						4.75		4.75	5.00			5.00	4.25
Interest coverage ratio						2.50		2.50	2.5				3.00
Revolving Credit Facility \| Revolving Credit Facility Amendment Five \| Legal Fees
Debt Instrument [Line Items]
Legal and structuring fees				$ 31,000
Revolving Credit Facility \| Revolving Credit Facility Amendment Five \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate period increase (decrease)				3.50%
Revolving Credit Facility \| Revolving Credit Facility Amendment Six
Debt Instrument [Line Items]
Net leverage ratio		2.75			5.5		5.5					6.25
Interest coverage ratio	1.50				1.75		1.75		1.25			1.25
Arranger fee		$ 100,000
Legal Fees		$ 36,000
Revolving Credit Facility \| Revolving Credit Facility Amendment Six \| Scenario Forecast
Debt Instrument [Line Items]
Net leverage ratio											5.25
Interest coverage ratio											2.25
Revolving Credit Facility \| Revolving Credit Facility Amendment Six \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate period increase (decrease)		4.75%
Revolving Credit Facility \| Revolving Credit Facility Amendment Four \| Legal Fees
Debt Instrument [Line Items]
Legal and structuring fees														$ 30,000
Senior Secured Term Loan Credit Facility
Debt Instrument [Line Items]
Number of tranches of debt \| tranch																3
Term B-2 Loan
Debt Instrument [Line Items]
Term loan B credit facility																$ 235,000,000
Term B-3 Loan
Debt Instrument [Line Items]
Term loan B credit facility																165,000,000
Net leverage ratio						1.75		1.75	1.75			1.75	1.75
Term B-3 Loan \| Term Loan Facility Amendment Six
Debt Instrument [Line Items]
Net leverage ratio						4.75		4.75	5.00			5.00	4.25
Term B-3 Loan \| Term Loan Facility Amendment Six \| LIBOR
Debt Instrument [Line Items]
Debt interest rate, applicable margin				6.75%
Term B-3 Loan \| Term Loan Facility Amendment Six \| Alternate Base Rate
Debt Instrument [Line Items]
Debt interest rate, applicable margin				5.75%
Term B-4 Loan
Debt Instrument [Line Items]
Term loan B credit facility																$ 50,000,000
Term Loan B Credit Facility
Debt Instrument [Line Items]
Net leverage ratio					5.50		5.50
Interest coverage ratio					1.75	5.00	1.75	5.00	5.00				5.00
Term Loan B Credit Facility \| Scenario Forecast
Debt Instrument [Line Items]
Net leverage ratio										4.75	5.25
Interest coverage ratio											2.25
Term Loan B Credit Facility \| Term Loan Facility Amendment Six
Debt Instrument [Line Items]
Interest coverage ratio						2.50		2.50	2.50			2.50	3.00
Term B Loans
Debt Instrument [Line Items]
Principal payment reductions							$ 1,120,000
Term B Loans \| Term Loan Facility Amendment Six \| LIBOR
Debt Instrument [Line Items]
Debt interest rate, applicable margin							6.75%
Term B Loans \| Term Loan Facility Amendment Six \| Alternate Base Rate
Debt Instrument [Line Items]
Debt interest rate, applicable margin							5.75%
Letter of Credit
Debt Instrument [Line Items]
Borrowing capacity															20,000,000
Term Loan Facility
Debt Instrument [Line Items]
Line of credit facility, amount outstanding			200,000,000		$ 200,000,000		$ 200,000,000
Net leverage ratio	1.75				1.75		1.75					5.00
Interest coverage ratio	5.0				5.0		5.0		2.50			2.5
Proceeds from revolving credit facility			200,000,000
Term Loan Facility \| Scenario Forecast
Debt Instrument [Line Items]
Net leverage ratio										1.75	1.75
Interest coverage ratio											5.0
Term Loan Facility \| Term Loan Facility Amendment Seven
Debt Instrument [Line Items]
Net leverage ratio	5.5				5.5		5.5					6.25
Interest coverage ratio	1.50				1.75		1.75		1.25			1.25
Term Loan Facility \| Term Loan Facility Amendment Seven \| Scenario Forecast
Debt Instrument [Line Items]
Net leverage ratio										4.75	5.25
Interest coverage ratio											2.25
Term Loan B Credit Facility
Debt Instrument [Line Items]
Amortization of debt issuance costs					$ 540,000	$ 1,049,000	$ 1,607,000	$ 3,029,000
Term Loan B Credit Facility \| LIBOR
Debt Instrument [Line Items]
Debt interest rate, applicable margin							6.75%		6.75%
Term Loan B Credit Facility \| Term Loan Facility Amendment Six
Debt Instrument [Line Items]
Arranger fee				$ 1,102,000
Term Loan B Credit Facility \| Term Loan Facility Amendment Six \| Other Fees and Expenses
Debt Instrument [Line Items]
Legal and structuring fees				12,000
Term Loan B Credit Facility \| Term Loan Facility Amendment Six \| Legal Fees
Debt Instrument [Line Items]
Legal and structuring fees				$ 31,000
Term Loan B Credit Facility \| Term Loan Facility Amendment Seven
Debt Instrument [Line Items]
Arranger fee			776,000
Legal Fees			55,000
OCI Beaumont LLC
Debt Instrument [Line Items]
Borrowing capacity			200,000,000
OCI Beaumont LLC \| Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity			$ 40,000,000
Intercompany revolving credit facility, interest rate description							Borrowings under the Term Loan Facility—Related Party bear interest at a rate equal to the sum of (i) the rate per annum applicable to the Term Loan B Credit Facility (including as such per annum rate may fluctuate from time to time in accordance with the terms of the agreement governing the Term Loan B Credit Facility) discussed in note 5(b) plus (ii) 0.25%.
Rate of commitment fee			0.50%
Line of credit facility, amount outstanding					0		$ 0		$ 35,000,000
Debt interest rate, applicable margin							0.25%
OCI Beaumont LLC \| Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Debt interest rate, applicable margin							0.25%		0.25%
OCI Beaumont LLC \| Before Reduction for Amended Revolving Credit Agreement Indebtedness
Debt Instrument [Line Items]
Borrowing capacity															$ 40,000,000
OCI Beaumont LLC \| Term Loan Facility
Debt Instrument [Line Items]
Line of credit facility, amount outstanding					$ 200,000,000		$ 200,000,000		$ 200,000,000
Debt interest rate, applicable margin							0.25%
OCI Beaumont LLC \| Term Loan Facility \| LIBOR
Debt Instrument [Line Items]
Debt interest rate, applicable margin							0.25%		0.25%
OCI Beaumont LLC \| IPO
Debt Instrument [Line Items]
Intercompany revolving credit facility, interest rate description							sum of (i) the rate per annum applicable to the Revolving Credit Facility (including as such per annum rate may fluctuate from time to time in accordance with the terms of the agreement governing the Revolving Credit Facility) discussed in note 5(b), plus (ii) 0.25%.