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Benefit Plans - Summary of Characteristics of Options Outstanding (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding at 12/31/15 | shares	2,812
Weighted-Average Remaining Contractual Life (Years)	5 years 7 months 6 days
Weighted-Average Exercise Price - Options Outstanding	$ 20.29
Exercisable at 12/31/15 | shares	1,760
Weighted-Average Exercise Price - Options Exercisable	$ 21.69
0.00 - 12.00 [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	$ 12.00
Outstanding at 12/31/15 | shares	566
Weighted-Average Remaining Contractual Life (Years)	3 years 3 months 18 days
Weighted-Average Exercise Price - Options Outstanding	$ 6.92
Exercisable at 12/31/15 | shares	566
Weighted-Average Exercise Price - Options Exercisable	$ 6.92
12.01 - 16.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Limit	12.01
Exercise Price Range, Upper Limit	$ 16.00
Outstanding at 12/31/15 | shares	371
Weighted-Average Remaining Contractual Life (Years)	5 years 8 months 12 days
Weighted-Average Exercise Price - Options Outstanding	$ 13.85
Exercisable at 12/31/15 | shares	371
Weighted-Average Exercise Price - Options Exercisable	$ 13.85
16.01 - 21.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Limit	16.01
Exercise Price Range, Upper Limit	$ 21.00
Outstanding at 12/31/15 | shares	1,415
Weighted-Average Remaining Contractual Life (Years)	7 years 10 months 24 days
Weighted-Average Exercise Price - Options Outstanding	$ 17.64
Exercisable at 12/31/15 | shares	363
Weighted-Average Exercise Price - Options Exercisable	$ 16.76
21.01 - 69.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Limit	21.01
Exercise Price Range, Upper Limit	$ 69.50
Outstanding at 12/31/15 | shares	460
Weighted-Average Remaining Contractual Life (Years)	1 year 6 months
Weighted-Average Exercise Price - Options Outstanding	$ 50.09
Exercisable at 12/31/15 | shares	460
Weighted-Average Exercise Price - Options Exercisable	$ 50.09

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

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)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

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

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- Definition

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

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef
-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=6415400&loc=d3e5070-113901

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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.

+ 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 (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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