Capitalized compensation costs related to share based awards.

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Defined contribution plan eligible period of service for participation in plan.

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Employee stock ownership plan ESOP shares in ESOP as percentage of outstanding stock.

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Minimum age for employees to participate in KSOP.

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Share based compensation arrangement by share based payment award award vesting rights percentage vested on anniversary.

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Share based compensation arrangement by share based payment award equity instruments other than options expected to vest.

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Share based compensation arrangement by share based payment award number of shares available for grant period increase decrease.

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Share based compensation arrangement by share based payment award options forfeitures and expirations till date.

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Share based compensation arrangement by share based payment award options grants cumulative number.

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Share based compensation arrangement by share based payment award options grants cumulative number weighted average exercise price range lower.

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Share based compensation arrangement by share based payment award options grants cumulative number weighted average exercise price range upper.

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Share based compensation arrangement by share based payment award options outstanding exercise price range lower range limit.

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Share based compensation arrangement by share based payment award options outstanding exercise price range upper range limit.

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Share based compensation arrangement by share based payment award shares issued till date.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Dividends paid on stock held by an employee stock ownership plan.

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Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

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The tax benefit resulting from dividends paid on preferred stock held by an employee stock option plan, when that stock is not a common stock equivalent.

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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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Number of additional shares authorized for issuance under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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Number of shares issued under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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

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Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 08, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 5,892,000	$ 4,111,000	$ 3,198,000
Tax benefit related to share-based compensation expense	1,600,000	1,100,000	1,300,000
Capitalized share-based compensation expense	$ 0	$ 0	$ 0
Stock option plans remain outstanding	580,140	845,600	1,208,860	1,584,435
Weighted average grant date fair value			$ 6.28
Number of options, granted	0	0	299,600
Eligible period of service for participation in plan	3 months
Minimum age for employees to participate in KSOP	21 years
Dividends deducted	$ 400,000
Tax benefit from dividends	$ 100,000
Shares outstanding, employee stock ownership plan	241,956
Percentage of total common shares outstanding	1.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized	1,708,914
Stock options granted	8,458,600
Stock options, exercise prices lower	$ 3.47
Stock options, exercise prices upper	$ 40.37
Purchase of shares	6,214,548
Stock option shares terminated	1,663,912
Stock option plans remain outstanding	580,140
Stock options outstanding, exercise prices lower	$ 24.60
Stock options outstanding, exercise prices upper	$ 40.37
Stock options vesting period	5 years
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	7 years
Options issued to non-employee advisors	0
Aggregate intrinsic value of options exercised and sold	$ 9,100,000	$ 9,000,000.0	$ 5,000,000.0
Total unrecognized compensation cost	$ 1,400,000
Expected recognition period of unrecognized compensation expense	1 year 1 month 6 days
Performance-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period	3 years	5 years	5 years
Percentage of vesting annually at anniversary			20.00%
Number of RSU's expected to vest	200,839
Performance-based RSUs [Member] \| Vesting after three years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting RSUs	100.00%	100.00%	60.00%
Service-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU's expected to vest	81,984
Number of forfeitures expected	0
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected recognition period of unrecognized compensation expense	2 years 1 month 6 days
Number of forfeitures expected	840	21,200	66,200
Total fair value of RSU's vested based on weighted average grant date values	$ 1,200,000	$ 1,000,000.0	$ 1,000,000.0
Stock-based compensation expense for restricted stock	4,700,000	$ 2,600,000	$ 1,400,000
Total unrecognized compensation expense net of forfeitures	$ 6,900,000
Maximum [Member] \| Service-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period	14 months
Minimum [Member] \| Service-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period	12 months
2016 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reduction in common stock available for grant	2
Common Stock [Member] \| 2016 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock remained available for grants of awards					2,000,000
Common Stock [Member] \| 2016 Stock Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of award (in years)	7 years
Common Stock [Member] \| 2016 Stock Incentive Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Rate of exercise price for equity award granted	100.00%