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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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

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Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.

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Stock-Based Compensation - Additional Information (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($) Tranche $ / shares shares	Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits related to windfalls		$ 11,600,000
Number of restricted stock units issued \| shares	544,105
Weighted average grant date fair value of the stock options granted \| $ / shares	$ 0.93
Number of equal tranches \| Tranche	4
Vest in Four Equal Tranches
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares granted to awards, share-based compensation arrangements \| shares	1,508,159
Vest Over Four Year Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares granted to awards, share-based compensation arrangements \| shares	642,378
Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to options	$ 700,000
Tranche achievement date	2017-12
Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, share-based compensation arrangements	$ 0
Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, share-based compensation arrangements	0
Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, share-based compensation arrangements	$ 0
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of the stock options granted \| $ / shares	$ 1.31
Aggregate number of shares granted to awards, share-based compensation arrangements \| shares	2,150,537
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Unrecognized compensation expense related to options	$ 4,400,000
Stock Options \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock granted, share-based compensation arrangements	2,000,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of Restricted stock options granted , value	$ 600,000
Weighted average grant date fair value of the stock options granted \| $ / shares	$ 1.10
Unrecognized compensation expense related to non-option	$ 4,200,000
Options vest over vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to options	$ 3,900,000