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Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 12, 2018	Sep. 05, 2017
Equity [Line Items]
Shares repurchased during period	$ 10,117,000	$ 2,746,000
December Two Thousand Eighteen Share Repurchase Program [Member]
Equity [Line Items]
Shares repurchased (in shares)	320,500
Shares repurchased during period	$ 10,100,000
September Two Thousand Seventeen Share Repurchase Program [Member]
Equity [Line Items]
Shares repurchased (in shares)		92,749
Shares repurchased during period		$ 2,700,000
Maximum [Member] | December Two Thousand Eighteen Share Repurchase Program [Member]
Equity [Line Items]
Amount of shares authorized to repurchase			$ 20,000,000
Maximum [Member] | September Two Thousand Seventeen Share Repurchase Program [Member]
Equity [Line Items]
Amount of shares authorized to repurchase				$ 20,000,000

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

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