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Common Stock and Treasury Stock - Additional Information (Detail) - USD ($)	9 Months Ended	73 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Feb. 28, 2018
Stock authorized to purchase under stock repurchase program			$ 200,000,000
Repurchase of common stock, shares	2,346,427	44,129,393
Repurchase of common stock, value	$ 54,500,000	$ 547,800,000
Maximum [Member]
Remaining value of shares authorized for purchase under the stock repurchase program	$ 176,600,000	$ 176,600,000

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Number of shares that have been repurchased during the period and are being held in treasury.

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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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