Share-based Compensation - Summary of Information Regarding Outstanding and Exercisable Stock Options (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding	6,766hes_OptionsOutstanding
Outstanding Options, Weighted-Average Remaining Contractual Life	4 years
Outstanding Options, Weighted-Average Exercise Price per Share	$ 66.79
Options Exercisable	6,594hes_OptionsExercisable
Options Exercisable, Weighted-Average Exercise Price per Share	$ 66.47
Exercise Price Range 20.00-40.00 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 20.00
Range of Exercise Prices, upper limit	$ 40.00
Options Outstanding	65
Outstanding Options, Weighted-Average Remaining Contractual Life	1 year
Outstanding Options, Weighted-Average Exercise Price per Share	$ 29.96
Options Exercisable	65
Options Exercisable, Weighted-Average Exercise Price per Share	$ 29.96
Exercise Price Range 40.01-50.00 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 40.01
Range of Exercise Prices, upper limit	$ 50.00
Options Outstanding	684
Outstanding Options, Weighted-Average Remaining Contractual Life	2 years
Outstanding Options, Weighted-Average Exercise Price per Share	$ 49.42
Options Exercisable	681
Options Exercisable, Weighted-Average Exercise Price per Share	$ 49.44
Exercise Price Range 50.01-60.00 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 50.01
Range of Exercise Prices, upper limit	$ 60.00
Options Outstanding	1,927
Outstanding Options, Weighted-Average Remaining Contractual Life	4 years
Outstanding Options, Weighted-Average Exercise Price per Share	$ 55.08
Options Exercisable	1,921
Options Exercisable, Weighted-Average Exercise Price per Share	$ 55.08
Exercise Price Range 60.01-80.00 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 60.01
Range of Exercise Prices, upper limit	$ 80.00
Options Outstanding	1,302
Outstanding Options, Weighted-Average Remaining Contractual Life	4 years
Outstanding Options, Weighted-Average Exercise Price per Share	$ 60.68
Options Exercisable	1,302
Options Exercisable, Weighted-Average Exercise Price per Share	$ 60.68
Exercise Price Range 80.01-120.00 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 80.01
Range of Exercise Prices, upper limit	$ 120
Options Outstanding	2,788
Outstanding Options, Weighted-Average Remaining Contractual Life	5 years
Outstanding Options, Weighted-Average Exercise Price per Share	$ 82.85
Options Exercisable	2,625
Options Exercisable, Weighted-Average Exercise Price per Share	$ 83.00

Options Exercisable.

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- Definition

Options outstanding.

+ References

No definition available.

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

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