Aggregate number of common shares reserved for future issuance.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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).

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

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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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 and are expected to vest over a specific period.

+ References

No definition available.

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- Definition

Percentage of monthly vesting of share-based compensation awards.

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No definition available.

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Share-based compensation - 2010 Plan (Detail) - USD ($)	1 Months Ended	12 Months Ended
Share-based compensation - 2010 Plan (Detail) - USD ($)	Dec. 31, 2010	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued to depositary bank to reserve for future exercise of share options or vesting of restricted shares					10,000,000
Minimum \| Share options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award vesting period	7 years
Maximum \| Share options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award vesting period	10 years
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant		8,315,463
Total fair value, share options vested		$ 0	$ 0	$ 132,000
2010 Plan \| Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award vesting period		32 months
2010 Plan \| Share options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs on share options		$ 0	$ 0
2010 Plan \| Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		800,000	6,750,520	2,050,000
Number of restricted share vested		1,296,540	267,630	115,125
Unrecognized compensation costs on restricted shares		$ 8,981,000	$ 12,347,000
2010 Plan \| Restricted shares [Member] \| Officers and Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of options vesting monthly		20.00%
2010 Plan \| Restricted shares [Member] \| Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares expected to vest		10,770,520	9,970,520
2010 Plan \| Restricted shares [Member] \| Nonemployee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted share vested		60,000	60,000
2010 Plan \| Restricted shares [Member] \| Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares expected to vest		1,331,500
2010 Plan \| Restricted shares [Member] \| Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares expected to vest		1,321,500
2010 Plan \| Restricted shares [Member] \| Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares expected to vest		1,311,500
2010 Plan \| Restricted shares [Member] \| Tranche Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares expected to vest		1,070,000
2010 Plan \| Restricted shares [Member] \| Tranche Five [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares expected to vest		150,000
2010 Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	26,822,828