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Employee Share Plans - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retirement Plans [Line Items] |  |  |
Holding period of stock | 1 year |  |
Maximum stock based compensation awards granted under the plan | 9,600,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used | Black-Scholes-Merton option-pricing model |  |
Fair value of stock options granted | $ 3.49 | $ 2.40 | $ 2.34
Options awarded under the plans vesting period | 4 years |  |
Restricted Stock Awards [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Compensation cost for non-vested stock options weighted average period | 1 year 1 month 28 days |  |
Unrecognized compensation cost for restricted stock awards | $ 8,500,000 |  |
Total fair value of shares vested during period | 3,400,000 | $ 3,300,000 | $ 3,100,000
Market value of shares awarded during period | $ 4,400,000 | $ 3,200,000 | $ 3,300,000
2014 Stock Incentive Plan [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Share available for future grant | 6,400,000 |  |
Employee Stock Purchase Plan [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Termination date of the Employee Stock Purchase Plan | Jun. 30, 2020 |  |
Price an employee pays for shares as percentage of fair market value | 85.00% |  |
Stock Option [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Percentage of incremental vesting schedule | 25.00% | 25.00% | 25.00%
Incremental vesting schedule period | 4 years |  |
Stock options expiry date | 6 years |  |
Options awarded under the plans vesting period | 4 years |  |
Weighted-average grant-date fair value of stock options granted | $ 2,300,000 | $ 1,600,000 | $ 2,100,000
Aggregate intrinsic value of stock options exercised | 9,400,000 | $ 4,200,000 | $ 4,600,000
Unrecognized compensation cost for non-vested stock option | $ 5,100,000 |  |
Compensation cost for non-vested stock options weighted average period | 1 year 3 months 18 days |  |
Maximum [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Shares purchased under ESPP | 2,000,000 |  |
Maximum [Member] | Restricted Stock Awards [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Options awarded under the plans vesting period | 4 years |  |
Restricted stock outstanding release from restriction period range | 2021-05 |  |
Maximum [Member] | Employee Stock Purchase Plan [Member] |  |  |
Retirement Plans [Line Items] |  |  |
ESPP allows qualified employees to purchase shares of common stock | $ 25,000 |  |
Minimum [Member] | Restricted Stock Awards [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Options awarded under the plans vesting period | 1 year |  |
Restricted stock outstanding release from restriction period range | 2018-02 |  |

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- Definition Retirement Plans [Line Items] + References No definition available. + Details
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- Definition 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. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected. + 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 (f)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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