Long-term Incentive Compensation - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive program (LTIP) expense	$ 24,745	$ 33,451
Stock-based compensation expense	13,097	12,762
Estimated tax benefits recorded for stock-based compensation	4,539	4,458
Unrecognized compensation cost related to outstanding LTIP awards	107,824
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans	$ 58,688
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
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 2 months 12 days
Tax benefits from stock award exercises	$ 8,668	$ 9,366
Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted	104
Aggregate grant-date fair value	$ 1,432
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	16
Aggregate grant-date fair value	$ 1,133
Weighted-average expected life (in years)	2 years 9 months 18 days

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

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- Definition

Unrecognized cost of LTIP awards granted.

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

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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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-SubTopic 10
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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

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