Employee Stock-Based Compensation - Additional Information (Detail)	3 Months Ended
Mar. 31, 2017 $ / shares shares
Time Based Restricted Stock Unit Grants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value, granted \| $ / shares	$ 14.31
Time Based Restricted Stock Unit Grants \| 2007 and 2014 Incentive Plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs Granted	405,000
Time Based Restricted Stock Unit Grants \| 2007 and 2014 Incentive Plans One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs Granted	348,000
Stock award granted vesting period	3 years
Time Based Restricted Stock Unit Grants \| 2007 and 2014 Incentive Plans One \| Share Based Compensation Award Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	33.00%
Time Based Restricted Stock Unit Grants \| 2007 and 2014 Incentive Plans One \| Share Based Compensation Award Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	33.00%
Time Based Restricted Stock Unit Grants \| 2007 and 2014 Incentive Plans One \| Share Based Compensation Award Tranche Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	33.00%
Time Based Restricted Stock Unit Grants \| 2007 and 2014 Incentive Plans Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs Granted	57,000
Stock award granted vesting period	4 years
Time Based Restricted Stock Unit Grants \| 2007 and 2014 Incentive Plans Two \| Share Based Compensation Award Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	25.00%
Time Based Restricted Stock Unit Grants \| 2007 and 2014 Incentive Plans Two \| Share Based Compensation Award Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	25.00%
Time Based Restricted Stock Unit Grants \| 2007 and 2014 Incentive Plans Two \| Share Based Compensation Award Tranche Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	25.00%
Time Based Restricted Stock Unit Grants \| 2007 and 2014 Incentive Plans Two \| Share Based Compensation Award Tranche Four
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	25.00%
Performance and Service Condition Based Restricted Stock Unit Grants \| 2007 and 2014 Incentive Plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs Granted	174,000
Weighted average grant date fair value, granted \| $ / shares	$ 14.54
Market and Service Condition Based Restricted Stock Unit Grants \| 2007 and 2014 Incentive Plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs Granted	174,000
Stock award granted vesting period	3 years
Weighted average grant date fair value, granted \| $ / shares	$ 11.49
Stock Options \| 2014 Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award granted vesting period	4 years
Options, Granted	57,000
Exercise Price for the options on the grant date \| $ / shares	$ 12.94
Weighted average grant date fair value of option \| $ / shares	$ 7.26
Stock Options \| 2014 Incentive Plan \| Share Based Compensation Award Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	25.00%
Stock Options \| 2014 Incentive Plan \| Share Based Compensation Award Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	25.00%
Stock Options \| 2014 Incentive Plan \| Share Based Compensation Award Tranche Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	25.00%
Stock Options \| 2014 Incentive Plan \| Share Based Compensation Award Tranche Four
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	25.00%

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.

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=6415400&loc=d3e5070-113901

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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).

+ 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 (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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).

+ 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 (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

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- Definition

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.

+ 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 (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

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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=6415400&loc=d3e5070-113901

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- Definition

Percentage of vesting of share-based compensation awards.

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