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Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Parenthetical) (Detail)	Jun. 30, 2018	Dec. 31, 2017
5.50% Working Capital Revolver Loan [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate	5.50%	5.50%
5.73% Secured Promissory Note Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, effective Interest Rate	5.73%	5.73%
5.25% Secured Promissory Note Due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, effective Interest Rate	5.25%	5.25%
6.25% Secured Promissory Note Due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, effective Interest Rate	6.25%	6.25%

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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+ References

No definition available.

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-Section S99
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