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Stockholders' Equity - Additional Information (Detail) - USD ($)			3 Months Ended				6 Months Ended
	Jul. 30, 2018	Jul. 25, 2011	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000,000
Stock repurchase, shares		1,770,000	0		0		0	0
Value of shares repurchased		$ 52,000,000
Cash dividends per common share			$ 0.20	$ 0.180	$ 0.18	$ 0.175	$ 0.38	$ 0.35
Dividend payment to common shareholders			$ 20,750,000	$ 20,750,000	$ 18,903,000	$ 18,903,000	$ 20,750,000	$ 18,903,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Jul. 30, 2018
Cash dividend to be paid	$ 0.20
Dividend to be paid date	Sep. 07, 2018
Dividend declared, shareholders of record date	Aug. 27, 2018

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

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

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