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Stock Compensation - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unissued common stock available for grant under the plans (in shares)	5,500,000
Share-based compensation expense	$ 10,100,000	$ 10,000,000.0
Grants of stock option awards in period (in shares)	0	0
Stock option awards outstanding (in shares)	543,673
Weighted-average exercise price of outstanding stock option awards (in dollars per share)	$ 23.53
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 10,100,000	$ 9,900,000
Aggregate weighted-average grant-date fair value of units granted	16,800,000	17,900,000
Total unrecognized compensation cost	$ 15,200,000
Unrecognized compensation cost, weighted-average recognition period	2 years
Aggregate weighted-average grant-date fair value of units vested	$ 14,800,000	10,300,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 0	$ 100,000
Performance-Based Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares which will vest after achievement of goals (in shares)	0
Performance-Based Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares which will vest after achievement of goals (in shares)	2

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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