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Share Based Compensation - Schedule of Information with Respect to Outstanding and Exercisable Stock Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options Outstanding	3,900,435	2,591,887	3,353,462	3,574,614
Options Outstanding, Weighted Average Exercise Price	$ 15.15	$ 25.96	$ 27.79	$ 28.29
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	6 years 9 months 18 days
Options Exercisable, Number Exercisable	2,203,417
Options Exercisable, Weighted Average Exercise Price	$ 23.42
Range of Exercise Prices $2.20 - $2.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 2.20
Range of Exercise Prices, Maximum	$ 2.20
Options Outstanding, Number of Options Outstanding	644,628
Options Outstanding, Weighted Average Exercise Price	$ 2.20
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	9 years 3 months 7 days
Options Exercisable, Number Exercisable
Options Exercisable, Weighted Average Exercise Price	$ 0.00
Range of Exercise Prices $2.62 - $2.65 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 2.62
Range of Exercise Prices, Maximum	$ 2.65
Options Outstanding, Number of Options Outstanding	96,729
Options Outstanding, Weighted Average Exercise Price	$ 2.65
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	9 years 7 months 10 days
Options Exercisable, Number Exercisable	2,221
Options Exercisable, Weighted Average Exercise Price	$ 2.62
Range of Exercise Prices $2.72 - $2.72 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 2.72
Range of Exercise Prices, Maximum	$ 2.72
Options Outstanding, Number of Options Outstanding	700,972
Options Outstanding, Weighted Average Exercise Price	$ 2.72
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	9 years 2 months 1 day
Options Exercisable, Number Exercisable	337,500
Options Exercisable, Weighted Average Exercise Price	$ 2.72
Range of Exercise Prices $2.82 - $6.51 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 2.82
Range of Exercise Prices, Maximum	$ 6.51
Options Outstanding, Number of Options Outstanding	415,002
Options Outstanding, Weighted Average Exercise Price	$ 3.79
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	9 years 2 months 16 days
Options Exercisable, Number Exercisable	84,648
Options Exercisable, Weighted Average Exercise Price	$ 4.94
Range of Exercise Prices $8.63 - $13.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 8.63
Range of Exercise Prices, Maximum	$ 13.67
Options Outstanding, Number of Options Outstanding	394,500
Options Outstanding, Weighted Average Exercise Price	$ 9.81
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	7 years 1 month 17 days
Options Exercisable, Number Exercisable	223,804
Options Exercisable, Weighted Average Exercise Price	$ 10.70
Range of Exercise Prices $14.96 - $22.04 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 14.96
Range of Exercise Prices, Maximum	$ 22.04
Options Outstanding, Number of Options Outstanding	480,384
Options Outstanding, Weighted Average Exercise Price	$ 20.31
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	4 years 9 months 29 days
Options Exercisable, Number Exercisable	437,192
Options Exercisable, Weighted Average Exercise Price	$ 20.17
Range of Exercise Prices $22.13 - $30.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 22.13
Range of Exercise Prices, Maximum	$ 30.67
Options Outstanding, Number of Options Outstanding	481,244
Options Outstanding, Weighted Average Exercise Price	$ 27.67
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	5 years 10 months 28 days
Options Exercisable, Number Exercisable	431,076
Options Exercisable, Weighted Average Exercise Price	$ 27.96
Range of Exercise Prices $30.80 - $34.70 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 30.80
Range of Exercise Prices, Maximum	$ 34.70
Options Outstanding, Number of Options Outstanding	498,751
Options Outstanding, Weighted Average Exercise Price	$ 33.31
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	2 years 1 month 28 days
Options Exercisable, Number Exercisable	498,751
Options Exercisable, Weighted Average Exercise Price	$ 33.31
Range of Exercise Prices $34.86 - $62.56 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 34.86
Range of Exercise Prices, Maximum	$ 62.56
Options Outstanding, Number of Options Outstanding	185,100
Options Outstanding, Weighted Average Exercise Price	$ 54.94
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	8 months 19 days
Options Exercisable, Number Exercisable	185,100
Options Exercisable, Weighted Average Exercise Price	$ 54.94
Range of Exercise Prices $68.24 - $68.24 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 68.24
Range of Exercise Prices, Maximum	$ 68.24
Options Outstanding, Number of Options Outstanding	3,125
Options Outstanding, Weighted Average Exercise Price	$ 68.24
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	5 months 5 days
Options Exercisable, Number Exercisable	3,125
Options Exercisable, Weighted Average Exercise Price	$ 68.24

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://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

+ Details

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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://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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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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



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-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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X

- Definition

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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X

- Definition

Weighted average remaining contractual term for option awards outstanding, 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)

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X

- 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 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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