Long-term Incentive Compensation - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive program (LTIP) expense	$ 50,647	$ 69,692
Stock-based compensation expense	23,717	28,299
Estimated tax benefits recorded for stock-based compensation	8,160	10,028
Unrecognized compensation cost related to outstanding LTIP awards	139,505
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans	$ 70,835
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under performance-based cash component of LTIP costs, weighted average remaining period (in years)	1 year 1 month 6 days
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under stock-based component of LTIP costs, weighted average remaining period (in years)	1 year 4 months 24 days
Tax benefits from stock award exercises	$ 23,658	$ 28,040
Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted	1,075
Aggregate grant-date fair value	$ 14,954
Weighted-average expected life (in years)	4 years 2 months 12 days
Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted	220
Aggregate grant-date fair value	$ 16,555
Weighted-average expected life (in years)	3 years 4 months 24 days

Employee service share-based compensation estimated tax benefit from compensation expense.

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- Definition

Unrecognized cost of LTIP awards granted.

+ References

No definition available.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for the long-term incentive program, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of Long-term Incentive Program compensation cost.

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- Definition

Share-based compensation arrangement by share-based payment award, grant date fair value of options granted.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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- Definition

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.

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- Definition

Net number of share options (or share units) granted during the period.

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- Definition

Expected term of share-based compensation awards, 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
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