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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock based compensation	$ 44,000
Unrecognized stock based compensation, weighted average period of recognition	2 years 7 months 6 days
Value of stock option exercised during year	$ 468	$ 4,300	$ 224
Cash received from stock option exercises	500	9,200	400
Administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 34,000	$ 32,000	$ 28,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based share granted, percent of nonvested restricted stock units outstanding	35.00%
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		7,400
Shares reserved for issuance	15,000
Shares available for future grants	8,000
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		750
Discount allowed on employee stock purchase plan	15.00%
Number of share purchased under stock option plan	106
Stock option plan, average purchase price	$ 9.82
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of vested shares of original grant amount	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of vested shares of original grant amount	200.00%
Maximum \| Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance	1,000