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Stock-Based Compensation - Summary of Stock Options Outstanding (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Stock Options, Stock options outstanding, Beginning Balance	4,382
Number of Stock Options, Stock options exercised	(34)
Number of Stock Options, Stock options forfeited	(28)
Number of Stock Options, Stock options expired	(183)
Number of Stock Options, Stock options outstanding, Ending Balance	4,137	4,382
Number of Stock Options, Stock options exercisable	3,915
Weighted Avg. Exercise Price, Stock options outstanding, Beginning Balance	$ 22.91
Weighted Avg. Exercise Price, Stock options exercised	15.53
Weighted Avg. Exercise Price, Stock options forfeited	15.53
Weighted Avg. Exercise Price, Stock options expired	24.41
Weighted Avg. Exercise Price, Stock options outstanding, Ending Balance	22.96	$ 22.91
Weighted Avg. Exercise Price, Stock options exercisable	$ 23.39
Weighted Avg. Remaining Contractual Life In Years, Stock options outstanding	3 years 3 months 7 days	4 years 1 month 6 days
Weighted Avg. Remaining Contractual Life In Years, Stock options exercisable	3 years 1 month 9 days
Aggregate Intrinsic Value, Stock options outstanding	$ 0

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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