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Amount of noncash expense for share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Stockholders' Equity - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Aug. 05, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost	$ 3,283,000	$ 12,526,000
Amount share repurchase program of common shares			$ 25,000,000
Retiring President and Chief Executive Officer and Chief Financial Officer [Member] \| General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost		8,039,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost	894,000	1,734,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost	$ 2,385,000	$ 5,634,000
Vesting of restricted shares, withholding and exercise obligations	289,000	164,000
Restricted shares of common stock, aggregate values	$ 3,711,000	$ 3,181,000
Performance Based Restricted Stock [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Performance Based Restricted Stock [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance Based Restricted Stock Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost	$ 4,000	$ 5,158,000
Share Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares purchased and retired	0	0