Shareholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares	Dec. 31, 2014 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred shares, shares authorized	10,000,000	10,000,000
Preferred shares, par value \| $ / shares	$ 0.001	$ 0.001
Preferred shares, shares issued	0	0
Preferred shares, shares outstanding	0	0
Ordinary shares, shares authorized	500,000,000	500,000,000
Ordinary shares, par value \| $ / shares	$ 0.001	$ 0.001
Ordinary shares, shares issued	311,836,678	307,808,000
Ordinary shares, shares outstanding	311,836,678	307,808,000
Maximum \| Long Term Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ordinary shares authorized under Long-term incentive plan	45,000,000
Restricted Shares \| Long Term Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted shares granted	4,110,109
Time-vested restricted share awards	4 years
Average share price \| $ / shares	$ 0.35
Shares vested	3,874,842
Performance Shares \| Long Term Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted shares granted	1,872,973
Time-vested restricted share awards	3 years
Performance unit target conversion ratio	1
Shares vested	153,477
Performance Shares \| Maximum \| Long Term Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of target level	1.5
Performance Shares \| Minimum \| Long Term Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of target level	0
Restricted Share Awards And Performance Unit \| Long Term Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share compensation award date value vested \| $	$ 2.1
Director \| Restricted Shares \| Long Term Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Time-vested restricted share awards	1 year

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