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Share Based Compensation - Additional Information (Detail) $ / shares in Units, ¥ in Thousands			12 Months Ended
	May 29, 2014 shares	Jul. 16, 2010 shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2016 CNY (¥) shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2015 CNY (¥) shares	Dec. 31, 2017 CNY (¥) shares	Oct. 30, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, fair value of shares exercised during the period | ¥				¥ 926		¥ 3,391		¥ 5,240
Aggregate intrinsic value of options exercise | $			$ 306,000		$ 1,906,000		$ 15,519,000
Share based compensation expense			7,244,000	47,129		118,729		190,027
Dermot Entities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense			$ 884,000	¥ 5,752		¥ 10,871		¥ 8,439
Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, RSUs granted			611,111	611,111	1,059,668	1,059,668	952,178	952,178
Performance Based Awards | Option One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance review period			1 year	1 year
Performance Based Awards | Option Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance review period			4 years	4 years
Share-settled bonuses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, RSUs granted			469,149	469,149
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, RSUs granted			1,080,260	1,080,260
Aggregate fair value, unvested			$ 12,105,000						¥ 78,759
Weighted-average grant-date fair value | $ / shares			$ 6.31		$ 8.85		$ 18.27
Total fair value vested | $			$ 18,238,000		$ 14,849,000		$ 22,801,000
Unrecognized share-based compensation cost			$ 10,281,000						¥ 66,891
Unrecognized compensation costs, weighted-average recognition period			1 year 8 months 12 days	1 year 8 months 12 days
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, option expiry period		10 years
Share based compensation, option outstanding			1,699,186		2,031,940	2,031,940			1,699,186
Share based compensation, aggregate intrinsic value			$ 1,432,000						¥ 9,317
Share based compensation, fair value of option outstanding at grant date			$ 2,365,000						¥ 15,387
Share based compensation, weighted average grant-date fair value of option | $ / shares			$ 0		$ 2		$ 0
Share based compensation, fair value of shares exercised during the period | $			$ 39,000		$ 0		$ 3,111,000
2010 Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, maximum aggregate number of ordinary shares to be issued		39,272,595
Share based compensation, option vesting period		4 years
2010 Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, option vesting period		3 years
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, option expiry period	10 years
2014 Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, maximum aggregate number of ordinary shares to be issued	20,461,380									39,606,817
Share based compensation, option vesting period	4 years
Share based compensation arrangement by share based payment award maximum annual plan percentage increase to number of shares available for grant	15.00%
2014 Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, option vesting period	3 years

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Value of stock issued as a result of the exercise of stock options.

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