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Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended						9 Months Ended
	Oct. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend declared and paid per share		$ 0.19	$ 0.19	$ 0.19	$ 0.18	$ 0.18	$ 0.18
Aggregate dividend declared for the year								$ 10,200,000	$ 9,700,000
Dividend declared per share		$ 0.19			$ 0.18			$ 0.57	$ 0.54
Authorized to purchase of common stock under the stock repurchase program		$ 485,000,000						$ 485,000,000
Repurchase of common Stock		100,000						1,100,000	0
Cumulative aggregate cost of repurchase of common stock		$ 3,500,000						$ 40,000,000
Cumulative repurchase of common stock		16,100,000						16,100,000
Aggregate cost of repurchase of common stock								$ 464,900,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend declared per share	$ 0.19
Dividend payable, date declared	Dec. 20, 2017
Dividend payable, record date	Dec. 06, 2017

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Value of shares of common stock repurchased under the stock repurchase program over the life of the plan to date.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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Date the dividend to be paid was declared, in CCYY-MM-DD format.

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Amount of stock repurchase plan authorized.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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