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Stock-Based Compensation Plans and Employee Benefits - Activities for Unvested Stock Option Awards (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Granted	0	77	316
Number of Options, Forfeited	(262)	(366)	(392)
Weighted Average Exercise Price, Beginning balance	$ 27.64	$ 38.32	$ 40.58
Weighted Average Exercise Price, Spin-off adjustment	0
Weighted Average Exercise Price, Ending balance	$ 25.71	$ 27.64	$ 38.32
Unvested stock option awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options Outstanding, Beginning Balance	191
Number of Options, Granted	0
Number of Options, Spin-off adjustment	44
Number of Options, Vested	(125)
Number of Options, Forfeited	(32)
Number of Options Outstanding, Ending Balance	78	191
Weighted Average Exercise Price, Beginning balance	$ 2.63
Weighted-Average Grant-Date Fair Value, Granted	0.00
Weighted Average Exercise Price, Spin-off adjustment	0.00
Weighted-Average Grant-Date Fair Value, Vested	2.83
Weighted-Average Grant-Date Fair Value, Forfeited	2.61
Weighted Average Exercise Price, Ending balance	$ 2.31	$ 2.63

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- Definition

Share based compensation arrangement by share based payment award options spin off adjustment.

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Share based compensation arrangement by share based payment award options spin off adjustments weighted average grand date fair value.

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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 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.

+ 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)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Number of non-vested options outstanding.

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Weighted average grant-date fair value of non-vested options forfeited.

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Number of options vested.

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