Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Secured long-term debt	$ 125,172	$ 133,304
Less current portion	(32,524)	(32,409)
Total long-term debt	92,648	100,895
Secured Equipment Notes due in December 2020 [Member]
Debt Instrument [Line Items]
Secured long-term debt	31,490	33,066
Secured Equipment Notes due in September 2020 [Member]
Debt Instrument [Line Items]
Secured long-term debt	11,597	12,214
Secured Equipment Notes due in June 2020 [Member]
Debt Instrument [Line Items]
Secured long-term debt	6,056	6,395
Secured Equipment Notes due in March 2020 [Member]
Debt Instrument [Line Items]
Secured long-term debt	1,886	1,998
Secured Equipment Notes due in January 2020 [Member]
Debt Instrument [Line Items]
Secured long-term debt	7,088	7,533
Secured Equipment Notes due in December 2019 [Member]
Debt Instrument [Line Items]
Secured long-term debt	10,180	10,828
Secured Equipment Notes due in November 2019 [Member]
Debt Instrument [Line Items]
Secured long-term debt	21,131	22,514
Secured Equipment Notes due in September 2019 [Member]
Debt Instrument [Line Items]
Secured long-term debt	16,912	18,170
Secured Equipment Notes due in February 2019 [Member]
Debt Instrument [Line Items]
Secured long-term debt	14,724	15,974
Secured Equipment Notes due in June 2018 [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 4,108	$ 4,612

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.

No definition available.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

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 210.9-03.16)
-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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

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- Definition

Carrying value as of the balance sheet date of the portion of long-term, collateralized debt obligations due within one year or the operating cycle, if longer. Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20
-Article 5

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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

+ References

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