Stockholders' Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	Aug. 16, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Aug. 13, 2018	Dec. 01, 2017	May 18, 2017	Jun. 02, 2016	Nov. 05, 2015
Stockholders Equity [Line Items]
Total cost		$ 55,738,000	$ 168,094,000	$ 21,489,000
2016 Stock Repurchase Program
Stockholders Equity [Line Items]
Share repurchase program authorized amount						$ 300,000,000		$ 100,000,000
Stock repurchase program additional amount authorized						$ 100,000,000.0	$ 100,000,000
Available amount under repurchase program		$ 72,600,000
Shares of common stock repurchased and retired (in shares)		756,000	4,674,000	452,000
Average price per share (in dollars per share)		$ 53.88	$ 35.94	$ 41.06
Total cost		$ 40,722,000	$ 168,001,000	$ 18,577,000
2018 Stock Repurchase Program
Stockholders Equity [Line Items]
Share repurchase program authorized amount					$ 25,000,000.0
Shares of common stock repurchased and retired (in shares)	196,050
Average price per share (in dollars per share)	$ 76.51
Total cost	$ 15,000,000
2015 Stock Repurchase Program
Stockholders Equity [Line Items]
Share repurchase program authorized amount									$ 50,000,000.0
Shares of common stock repurchased and retired (in shares)				85,100
Average price per share (in dollars per share)				$ 34.16
Total cost				$ 2,900,000