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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 15, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 14, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares issued under ESPP |  |  |  |  | 148,520 | 158,194 | 188,453 |  |
Stock-based compensation expense |  |  |  |  | $ 20,360,000 | $ 13,683,000 | $ 43,613,000 |  |
Awards granted requisite service period |  |  |  |  | 3 years |  |  |  |
Incentive plan, weighted-average grant date fair value of stock options granted |  |  |  |  | $ 7.03 | $ 6.24 | $ 5.59 |  |
Incentive plan, total intrinsic value of stock options exercised |  |  |  |  | $ 15,800,000 | $ 13,400,000 | $ 6,800,000 |  |
Stock-based compensation expenses tax benefits |  |  |  |  | $ 0 | 1,700,000 | 14,300,000 |  |
Employee Stock Purchase Plan 2017 [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares of common stock reserved for issuance |  | 3,000,000 |  |  | 3,000,000 |  |  |  |
Permitted designation for purchase of common stock under ESPP |  |  |  |  | Participating employees are permitted to designate up to the lesser of $25,000 or 10% of their annual base compensation for the purchase of common stock under the ESPP. Purchases under the ESPP are made one calendar month after the end of each fiscal quarter. |  |  |  |
Employee participating annual base compensation designated for purchase of common stock, amount |  | $ 25,000 |  |  | $ 25,000 |  |  |  |
Employee participating annual base compensation designated for purchase of common stock, percent |  | 10.00% |  |  | 10.00% |  |  |  |
Price of common stock purchased under ESPP, percent |  |  |  |  | 85.00% |  |  |  |
Discount offered pursuant to ESPP, percentage |  |  |  |  | 15.00% |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 500,000 | $ 500,000 | $ 500,000 |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation costs |  | $ 1,900,000 |  |  | $ 1,900,000 |  |  |  |
Unrecognized compensation costs, weighted-average recognition periods |  |  |  |  | 10 months 24 days |  |  |  |
Tranche One [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation, trading price percentage |  |  |  |  |  |  | 133.00% |  |
Consecutive trading days |  |  |  |  |  |  | 20 days |  |
Share-based compensation, non-vested grant date fair value |  |  |  |  |  |  | $ 7.46 |  |
Tranche Two [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation, trading price percentage |  |  |  |  |  |  | 167.00% |  |
Consecutive trading days |  |  |  |  |  |  | 20 days |  |
Share-based compensation, non-vested grant date fair value |  |  |  |  |  |  | $ 7.06 |  |
Tranche Three [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation, trading price percentage |  |  |  |  |  |  | 200.00% |  |
Consecutive trading days |  |  |  |  |  |  | 20 days |  |
Share-based compensation, non-vested grant date fair value |  |  |  |  |  |  | $ 6.50 |  |
Restricted Share Awards (RSAs) [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards granted requisite service period |  |  |  |  |  | 3 years | 3 years |  |
Award vesting period |  |  |  |  |  | 1 year |  |  |
Number of shares vested |  |  |  |  | 231,473 |  |  |  |
Shares withheld to pay employees' portion of minimum payroll withholding taxes |  |  |  |  | 41,973 |  |  |  |
Award vesting percentage for each year |  |  |  |  | 33.00% | 33.00% | 33.00% |  |
Unrecognized compensation costs |  | 2,500,000 |  |  | $ 2,500,000 |  |  |  |
Unrecognized compensation costs, weighted-average recognition periods |  |  |  |  | 1 year 2 months 12 days |  |  |  |
Performance-Based Restricted Share Awards [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period | 1 year 3 months 18 days |  |  |  |  |  |  |  |
Number of shares vested |  |  |  |  | 173,636 |  |  |  |
Shares withheld to pay employees' portion of minimum payroll withholding taxes |  |  |  |  | 64,699 |  |  |  |
Threshold level percentage for share awards |  |  |  | 150.00% |  |  |  | 150.00% |
Performance-Based Restricted Share Awards [Member] | Tranche One [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  |  |  |  |  | 90.40% |  |
Restricted share awards, vesting increments on anniversary dates of grants |  |  |  |  |  |  |  | 33.00% |
Performance-Based Restricted Share Awards [Member] | Tranche Two [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted share awards, vesting increments on anniversary dates of grants |  |  |  |  |  |  |  | 33.00% |
Performance-Based Restricted Share Awards [Member] | Tranche Two [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  |  | 98.00% |  |  |  |  |
Performance-Based Restricted Share Awards [Member] | Tranche Two [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  |  | 100.00% |  |  |  |  |
Performance-Based Restricted Share Awards [Member] | Tranche Three [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted share awards, vesting increments on anniversary dates of grants |  |  |  |  |  |  |  | 33.00% |
Performance-Based Restricted Share Awards [Member] | Tranche Three [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  |  | 98.00% |  |  |  |  |
Performance-Based Restricted Share Awards [Member] | Tranche Three [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  |  | 100.00% |  |  |  |  |
Restricted Share Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares vested |  |  |  |  | 10,000 |  |  |  |
Unrecognized compensation costs |  | $ 10,800,000 |  |  | $ 10,800,000 |  |  |  |
Unrecognized compensation costs, weighted-average recognition periods |  |  |  |  | 2 years 1 month 6 days |  |  |  |
Restricted share awards, vesting increments on anniversary dates of grants |  |  |  |  | 33.00% |  |  |  |
2015 Grant [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  | 0.00% |  |  |  |  |  |
2015 Grant [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  | 100.00% |  |  |  |  |  |
2016 Grant [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  | 65.00% |  |  |  |  |  |
2016 Grant [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  | 0.00% |  |  |  |  |  |  |
2016 Grant [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  | 65.00% |  |  |  |  |  |  |
2017 Grant [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  | 100.00% |  |  |  |  |  |
2016 Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares of common stock reserved for issuance |  | 8,000,000 |  |  | 8,000,000 |  |  |  |
2016 Incentive Plan [Member] | Stock Options, Stock Appreciation Rights, Restricted Stock, Restricted Stock Units and Other Awards [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Maximum number of shares of Common Stock a participant may receive |  |  |  |  | 3,000,000 |  |  |  |
2016 Incentive Plan [Member] | Performance Shares or Performance Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Maximum aggregate value on the date of grant |  |  |  |  | $ 9,000,000 |  |  |  |
2005 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares of common stock reserved for issuance |  |  |  |  |  |  |  |  | 23,250,000
LTIP Performance Shares [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation costs |  | $ 3,800,000 |  |  | $ 3,800,000 |  |  |  |
Unrecognized compensation costs, weighted-average recognition periods |  |  |  |  | 1 year 2 months 12 days |  |  |  |
Total Shareholder Return [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock based compensation awards, award payout range, maximum |  | 200.00% | 200.00% |  | 200.00% | 200.00% | 200.00% |  |
Stock based compensation awards, award payout range, minimum |  |  |  |  | 0.00% | 0.00% | 0.00% |  |
Unrecognized compensation costs |  | $ 13,200,000 |  |  | $ 13,200,000 |  |  |  |
Unrecognized compensation costs, weighted-average recognition periods |  |  |  |  | 2 years |  |  |  |

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- Definition Percentage of restricted share awards that vest on each anniversary date from the date of grant. + References No definition available. + Details
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- Definition The highest aggregate value of performance units an employee can be granted under the plan per period. + References No definition available. + Details
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- Definition The highest dollar amount from their salary that an employee is permitted to utilize with respect to the plan. + References No definition available. + Details
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- Definition Minimum percentage of common stock price to grant date price of stock options to trigger vesting. + References No definition available. + Details
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- Definition The maximum percentage that can be achieved under the predetermined performance thresholds for the performance based restricted share awards. + References No definition available. + Details
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- Definition The expected attainment percentage for the awards based upon actual and forecasted sales and operating income. + References No definition available. + Details
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- Definition The maximum percentage that can be achieved under the predetermined performance thresholds for the performance shares. + References No definition available. + Details
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- Definition The minimum percentage that can be achieved under the predetermined performance thresholds for the performance shares. + References No definition available. + Details
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- Definition The expected attainment percentage for the shareholder return awards based upon current stock performance. + References No definition available. + Details
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- Definition Threshold period of specified consecutive trading days within which common stock price to grant date price of options must exceed threshold percentage for a specified number of trading days to vesting, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on offering date that participants pay for shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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