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Stockholders' Equity - Additional Information (Detail) - USD ($)			3 Months Ended								12 Months Ended
	Feb. 11, 2019	Jul. 25, 2011	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000,000
Stock repurchase, shares		2,588,000									818,000	0	44,798
Value of shares repurchased		$ 127,000,000									$ 75,000,000		$ 1,545,000
Average price of repurchased shares											$ 91.67		$ 34.50
Cash dividends per common share			$ 0.200	$ 0.200	$ 0.200	$ 0.180	$ 0.180	$ 0.175	$ 0.175	$ 0.175	$ 0.78	$ 0.71	$ 0.68
Dividend payment to common shareholders			$ 42,405,000	$ 42,405,000	$ 42,405,000	$ 42,405,000	$ 38,178,000	$ 38,178,000	$ 38,178,000	$ 38,178,000	$ 42,405,000	$ 38,178,000	$ 36,361,000
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	Mar. 08, 2019
Dividend declared, shareholders of record date	Feb. 25, 2019

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