Share-Based Compensation - Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
Dec. 01, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of share options, Outstanding, Beginning balance		20,972,776	20,222,662	20,891,782
Number of share options, Granted		1,566,381	1,076,761	320,000
Number of share options, Forfeited		(371,989)	(326,647)	(989,120)
Number of share options, Expired		(1,116,531)
Number of share options, Converted to restricted shares	(3,776,711)	(3,776,711)
Number of share options, Exercised		(7,333,641)
Number of share options, Outstanding, Ending balance		9,940,285	20,972,776	20,222,662	20,891,782
Weighted average exercise price, Beginning balance		$ 1.37	$ 1.30	$ 1.30
Number of share options, Vested and expected to vest, Ending balance		9,642,307	20,701,286
Weighted average exercise price, Granted		$ 3.23	$ 3.33	$ 2.73
Number of share options, Exercisable, Ending balance		9,129,958	19,382,156
Weighted average exercise price, Forfeited		$ 3.96	$ 3.32	$ 1.72
Weighted average exercise price, Expired		$ 0.26
Weighted average exercise price, Converted to restricted shares		$ 3.14
Weighted average exercise price, Exercised		$ 0.18
Weighted average exercise price, Ending balance		$ 1.88	$ 1.37	$ 1.30	$ 1.30
Aggregate intrinsic value, Outstanding, Beginning balance		$ 39,420	$ 40,788	$ 43,068
Weighted average exercise price, Vested and expected to vest at end of period		$ 1.86	$ 1.32
Aggregate intrinsic value, Outstanding, Ending balance		3,067	39,420	40,788	43,068
Weighted average exercise price, Exercisable at end of period		$ 1.81	$ 1.17
Aggregate intrinsic value, Vested and expected to vest, Ending balance		3,057	41,014
Weighted-average grant date fair value, Granted		$ 1.01	$ 1.27	$ 1.59
Aggregate intrinsic value, Exercisable, Ending balance		$ 3,042	$ 40,771
Weighted-average grant date fair value, Vested and expected to vest, Ending balance		$ 0.49	$ 0.40
Weighted-average grant date fair value, Exercisable, Ending balance		$ 0.41	$ 0.31
Weighted-average remaining contractual life, Ending balance		1 year 11 months 12 days	2 years 11 days	2 years 9 months 26 days	3 years 10 months 13 days
Weighted-average remaining contractual life, Vested and expected to vest, Ending balance		1 year 10 months 13 days	1 year 10 months 21 days
Weighted-average remaining contractual life, Exercisable, Ending balance		1 year 5 months 27 days	1 year 8 months 1 day

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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.

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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.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Share Based Compensation Arrangement By Share Based Payment Award Options Converted And Cancelled

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The weighted average grant-date fair value of options 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.

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The weighted-average grant date fair value, as of the balance sheet date, (at which grantees can acquire the shares reserved for issuance) of outstanding stock options that are fully vested or expected to vest.

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