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Stockholders' Equity - Additional Information (Detail) - USD ($)			3 Months Ended
	May 08, 2019	Jul. 25, 2011	Mar. 31, 2019	Mar. 31, 2018
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000,000
Stock repurchase, shares		2,588,000	0	0
Value of shares repurchased		$ 127,000,000
Cash dividends per common share			$ 0.20	$ 0.18
Dividend payment to common shareholders			$ 10,843,000	$ 9,808,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Feb. 11, 2019
Cash dividend to be paid	$ 0.20
Dividend to be paid date	Jun. 07, 2019
Dividend declared, shareholders of record date	May 27, 2019

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

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