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Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	May 06, 2019	Dec. 12, 2018	Sep. 05, 2017
Equity [Line Items]
Shares repurchased during period	$ 14,107,000	$ 10,117,000	$ 8,370,000	$ 2,746,000
May Two Thousand Nineteen Share Repurchase Program [Member]
Equity [Line Items]
Shares repurchased (in shares)					338,274
Shares repurchased during period					$ 9,700,000
December Two Thousand Eighteen Share Repurchase Program [Member]
Equity [Line Items]
Shares repurchased (in shares)					468,108
Shares repurchased during period					$ 14,500,000
September Two Thousand Seventeen Share Repurchase Program [Member]
Equity [Line Items]
Shares repurchased (in shares)						342,749
Shares repurchased during period						$ 11,100,000
Maximum [Member] | May Two Thousand Nineteen Share Repurchase Program [Member]
Equity [Line Items]
Amount of shares authorized to repurchase							$ 40,000,000
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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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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