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Stock-Based Compensation Plans and Employee Benefits - Summary of Characteristics of Options Outstanding (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding at 12/31/18 | shares	446
Weighted-Average Remaining Contractual Life (Years)	5 years 2 months 12 days
Weighted-Average Exercise Price - Options Outstanding	$ 25.71
Exercisable at 12/31/18 | shares	368
Weighted-Average Exercise Price - Options Exercisable	$ 25.86
0.00 - 16.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Limit	0.00
Exercise Price Range, Upper Limit	$ 16.50
Outstanding at 12/31/18 | shares	33
Weighted-Average Remaining Contractual Life (Years)	6 months
Weighted-Average Exercise Price - Options Outstanding	$ 12.34
Exercisable at 12/31/18 | shares	33
Weighted-Average Exercise Price - Options Exercisable	$ 12.34
16.51 - 27.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Limit	16.51
Exercise Price Range, Upper Limit	$ 27.50
Outstanding at 12/31/18 | shares	327
Weighted-Average Remaining Contractual Life (Years)	5 years 6 months
Weighted-Average Exercise Price - Options Outstanding	$ 25.65
Exercisable at 12/31/18 | shares	249
Weighted-Average Exercise Price - Options Exercisable	$ 25.86
27.51 - 31.11 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Limit	27.51
Exercise Price Range, Upper Limit	$ 31.11
Outstanding at 12/31/18 | shares	86
Weighted-Average Remaining Contractual Life (Years)	5 years 8 months 12 days
Weighted-Average Exercise Price - Options Outstanding	$ 31.11
Exercisable at 12/31/18 | shares	86
Weighted-Average Exercise Price - Options Exercisable	$ 31.11

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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://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 number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans 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
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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

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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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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.

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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.

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