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Financial Instruments - Additional Information (Detail) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Financial Instrument [Line Items]
Estimated fair value of contingent liability	$ 0
Standby Letters of Credit
Financial Instrument [Line Items]
Fair value of contingent liability	2,430,000	$ 2,690,000
Performance Bonds
Financial Instrument [Line Items]
Fair value of contingent liability	$ 8,000,000	$ 4,000,000

X

- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

No definition available.

+ Details

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X

- Definition

Financial Instrument [Line Items]

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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X

- Details

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