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Benefit Plans - Activities for Unvested Stock Option Awards (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Granted	557	774	345
Number of Options, Forfeited	(472)	(320)	(193)
Weighted Average Exercise Price, Beginning balance	$ 22.48	$ 24.77	$ 25.70
Weighted Average Exercise Price, Ending balance	$ 20.29	$ 22.48	$ 24.77
Unvested stock option awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options Outstanding, Beginning Balance	1,039
Number of Options, Granted	557
Number of options, Vested	(438)
Number of Options, Forfeited	(106)
Number of Options Outstanding, Ending Balance	1,052	1,039
Weighted Average Exercise Price, Beginning balance	$ 3.23
Weighted-Average Grant-Date Fair Value, Granted	2.35
Weighted-Average Grant-Date Fair Value, Vested	3.64
Weighted-Average Grant-Date Fair Value, Forfeited	2.71
Weighted Average Exercise Price, Ending balance	$ 2.64	$ 3.23

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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://www.xbrl.org/2003/role/presentationRef
-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=6415400&loc=d3e5070-113901

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=6415400&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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Weighted average grant-date fair value of options vested.

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