Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 417,272	$ 420,220
Unamortized discount and debt issuance costs	(6,883)	(7,615)
Less current portion of long-term debt	11,752	13,745
Long-term debt, net	405,520	406,475
4.5% Working Capital Revolver Loan [Member]
Debt Instrument [Line Items]
Long-term debt		0
Senior Secured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	375,000	375,000
4.05% Secured Promissory Note Due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt	4,723	6,566
5.73% Secured Promissory Note Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	8,917	9,167
5.25% Secured Promissory Note Due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	13,532	14,272
5.04% Secured Promissory Note Due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	18,150	18,645
Other [Member]
Debt Instrument [Line Items]
Long-term debt	$ 3,833	$ 4,185

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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