The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1)

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

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1)

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

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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)(2)(i)-(ii)

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

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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)(2)(iii)(2)

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

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Options Converted And Other Than Options Granted In Period

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Converted In Period Weighted Average Grant Date Fair Value

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Expected To Vest Number

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No definition available.

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Share-Based Compensation - Summary of Restricted Shares Activities (Detail) (USD $)	0 Months Ended	12 Months Ended
	Dec. 01, 2014	Dec. 31, 2014	Dec. 31, 2013
Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares, Converted from share options	1,505,787
2010 share incentive plan [Member] \| Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares, Converted from share options		1,505,787
Number of restricted shares, Unvested, Ending balance		1,505,787
Number of restricted shares, Vested and expected to vest, Ending balance		1,279,919
Weighted-Average Grant-Date Fair Value, Converted from share options		$ 1.71
2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares, Granted		8,764,000
2013 Plan [Member] \| Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares, Unvested, beginning balance		8,095,238
Number of restricted shares, Granted		4,233,558	8,095,238
Number of restricted shares, Vested		(1,563,222)
Number of restricted shares, Forfeited		(3,564,796)
Number of restricted shares, Unvested, Ending balance		7,200,778	8,095,238
Number of restricted shares, Vested and expected to vest, Ending balance		7,683,884
Weighted-Average Grant Date Fair Value, Granted		$ 2.89	$ 3.15
2014 Plan [Member] \| Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares, Granted		3,896,500
Number of restricted shares, Unvested, Ending balance		3,896,500
Number of restricted shares, Vested and expected to vest, Ending balance		3,312,025
Weighted-Average Grant Date Fair Value, Granted		$ 1.77