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Summary of Movement in Non-Vested Share Options (Detail) (Employee Stock Option, USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Stock Option
Number of Shares
Beginning Balance	2,094,533
Granted	264,950
Vested	(641,773)
Forfeited	(249,629)
Ending Balance	1,468,081	2,094,533
Weighted Average Exercise Price
Beginning balance	$ 22.43
Granted	$ 33.09
Vested	$ 24.29
Forfeited	$ 22.97
Ending balance	$ 23.45	$ 22.43
Weighted Average Fair Value
Beginning Balance	$ 9.17
Granted	$ 12.05	$ 9.59	$ 8.20
Vested	$ 9.60
Forfeited	$ 9.46
Ending Balance	$ 9.45	$ 9.17

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Share Based Compensation Arrangement by Share Based Payment Award, Nonvested Options, Outstanding Weighted Average Exercise Price

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

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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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