Stockholder's Equity - Schedule of Shares Repurchased (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 06, 2019	May 06, 2019	Dec. 12, 2018	Sep. 05, 2017
Equity [Line Items]
Shares repurchased during the period	$ 66,186,000	$ 25,276,000	$ 18,141,000
November Two Thousand Nineteen Share Repurchase Program [Member]
Equity [Line Items]
Shares repurchased (in shares)	403,142	0
Shares repurchased during the period	$ 11,673,000
Shares repurchased during period (in dollars per share)	$ 28.96
November Two Thousand Nineteen Share Repurchase Program [Member] \| Maximum [Member]
Equity [Line Items]
Amount of stock repurchase plan authorized				$ 40,000,000
May Two Thousand Nineteen Share Repurchase Program [Member]
Equity [Line Items]
Shares repurchased (in shares)	1,466,575	0
Shares repurchased during the period	$ 40,000,000
Shares repurchased during period (in dollars per share)	$ 27.27
May Two Thousand Nineteen Share Repurchase Program [Member] \| Maximum [Member]
Equity [Line Items]
Amount of stock repurchase plan authorized					$ 40,000,000
December Two Thousand Eighteen Share Repurchase Program [Member]
Equity [Line Items]
Shares repurchased (in shares)	468,108	138,234
Shares repurchased during the period	$ 20,000,000
Shares repurchased during period (in dollars per share)	$ 32.98
December Two Thousand Eighteen Share Repurchase Program [Member] \| Maximum [Member]
Equity [Line Items]
Amount of stock repurchase plan authorized						$ 20,000,000
September Two Thousand Seventeen Share Repurchase Program [Member]
Equity [Line Items]
Shares repurchased (in shares)	0	550,455
Shares repurchased during the period	$ 19,789,000
Shares repurchased during period (in dollars per share)	$ 35.95
September Two Thousand Seventeen Share Repurchase Program [Member] \| Maximum [Member]
Equity [Line Items]
Amount of stock repurchase plan authorized							$ 20,000,000