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Common Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Nov. 30, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017	Nov. 30, 2014
Equity, Class of Treasury Stock [Line Items]
Cash dividends declared per share				$ 0.50
Dividends payable				$ 21,900
Dividend paid in cash			$ 21,911
Callcap Acquisition
Equity, Class of Treasury Stock [Line Items]
Business acquisition, percentage of voting interests acquired	100.00%
Cash paid for business acquisition	$ 24,993
Class B
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized to be repurchased					3,000,000
Treasury stock acquired, shares		90,000	0
Treasury stock repurchased		$ 0.01
Treasury stock acquired, value		$ 900	$ 0
Class B | Callcap Acquisition
Equity, Class of Treasury Stock [Line Items]
Stock issued during the period, shares	3,400,000
Common stock issuance period	4 years

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