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Stock-Based Compensation - Stock Options Outstanding (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding at 12/31/18	4,382	5,148
Options Exercisable at 12/31/18	4,131
Weighted Average Exercise Price, Options exercisable	$ 23.37
$14.88 - 18.96 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Range Limit	14.88
Upper Range Limit	$ 18.96
Options Outstanding at 12/31/18	1,257
Weighted Avg. Remaining Contractual Life In Years, Options Outstanding	5 years 11 months 4 days
Weighted Average Exercise Price, Options Outstanding	$ 15.87
Options Exercisable at 12/31/18	1,006
Weighted Average Exercise Price, Options exercisable	$ 15.99
$18.97 - 23.45 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Range Limit	18.97
Upper Range Limit	$ 23.45
Options Outstanding at 12/31/18	739
Weighted Avg. Remaining Contractual Life In Years, Options Outstanding	5 years 8 months 4 days
Weighted Average Exercise Price, Options Outstanding	$ 19.12
Options Exercisable at 12/31/18	739
Weighted Average Exercise Price, Options exercisable	$ 19.12
$23.46 - 30.35 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Range Limit	23.46
Upper Range Limit	$ 30.35
Options Outstanding at 12/31/18	1,223
Weighted Avg. Remaining Contractual Life In Years, Options Outstanding	3 years 2 months 4 days
Weighted Average Exercise Price, Options Outstanding	$ 23.87
Options Exercisable at 12/31/18	1,223
Weighted Average Exercise Price, Options exercisable	$ 23.87
$30.36 - 41.92 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Range Limit	30.36
Upper Range Limit	$ 41.92
Options Outstanding at 12/31/18	1,163
Weighted Avg. Remaining Contractual Life In Years, Options Outstanding	2 years 3 months 14 days
Weighted Average Exercise Price, Options Outstanding	$ 31.93
Options Exercisable at 12/31/18	1,163
Weighted Average Exercise Price, Options exercisable	$ 31.93

X

- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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

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