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Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Apr. 30, 2016	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend declared and paid per share		$ 0.18	$ 0.17
Aggregate dividend declared for the year		$ 3,200,000	$ 3,100,000
Dividend declared per share		$ 0.18	$ 0.17
Authorized to purchase of common stock under the stock repurchase program		$ 460,000,000
Repurchase of common Stock		0	200,000
Cumulative aggregate cost of repurchase of common stock			$ 5,700,000
Cumulative repurchase of common stock		15,000,000
Aggregate cost of repurchase of common stock		$ 423,100,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend declared per share	$ 0.18
Dividend payable, date declared	Jun. 22, 2016
Dividend payable, record date	Jun. 08, 2016

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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 paid during the period for each share of common stock outstanding.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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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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