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Stock-Based Compensation - Summary of Stock Options (Detail) - Stock Options [Member] shares in Thousands	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding shares, beginning of year | shares	7,507
Granted, shares | shares	1,387
Exercised, shares | shares	(2,645)
Forfeited or expired, shares | shares	(606)
Outstanding shares, end of year | shares	5,643
Exercisable shares, end of year | shares	2,921
Outstanding, Weighted Average Per Share Fair Value, beginning of year | $ / shares	$ 40.80
Granted, Weighted Average Per Share Fair Value | $ / shares	56.24
Exercised, Weighted Average Per Share Fair Value | $ / shares	37.20
Forfeited or expired, Weighted Average Per Share Fair Value | $ / shares	51.70
Outstanding, Weighted Average Per Share Fair Value, end of year | $ / shares	45.12
Exercisable, Weighted Average Per Share Fair Value, end of year | $ / shares	$ 38.84

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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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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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