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Share-Based Compensation - Certain Information Related to Stock Options and PSUs (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Options:
Options outstanding, beginning of period (in shares)	1,776,000
Options, granted (in shares)	400,000
Options, forfeited (in shares)	0
Options exercised (in shares)	(151,000)
Options, expired (in shares)	0
Options outstanding, end of period (in shares)inning of period (in shares)	2,025,000	1,776,000
Options, exercisable, end of period (in shares)	1,051
Weighted Average Exercise Price per Share:
Options outstanding, beginning of period, weighted average exercise price per share (in dollars per share)	$ 25.51
Options granted, weighted average exercise price per share (in dollars per share)	31.52
Options forfeited, weighted average exercise price per share (in dollars per share)	0
Options exercised, weighted average exercise price per share (in dollars per share)	17.67
Options expired, weighted average exercise price per share (in dollars per share)	0
Options outstanding, end of period, weighted average exercise price per share (in dollars per share)	27.28	$ 25.51
Options exercisable, end of period, weighted average exercise price per share (in dollars per share)	$ 24.07
Options outstanding, aggregate intrinsic value	$ 5,076
Options exercisable, aggregate intrinsic value	$ 4,866
Options outstanding, weighted average remaining term	6 years 8 months 23 days
Options exercisable, weighted average remaining term	5 years 10 months 24 days
Restricted Stock [Member]
Number of Shares:
Outstanding, beginning balance (in shares)	63,000
Granted (in shares)	50,000
Vested (in shares)	(97,000)
Outstanding, ending balance (in shares)	16,000	63,000
Weighted Average Grant Date Fair Value per Share:
Outstanding, beginning of period, weighted average grant date fair value per share (in dollars per share)	$ 34.38
Granted, weighted average grant date fair value (in dollars per share)	30.73	$ 33.64	$ 0
Vested, weighted average grant date fair value (in dollars per share)	33.10
Outstanding, end of period, weighted average grant date fair value per share (in dollars per share)	$ 30.85	$ 34.38
Performance Share Units [Member]
Number of Shares:
Outstanding, beginning balance (in shares)	220,000
Granted (in shares)	77,000
Vested (in shares)	(148,000)
Outstanding, ending balance (in shares)	149,000	220,000
Weighted Average Grant Date Fair Value per Share:
Outstanding, beginning of period, weighted average grant date fair value per share (in dollars per share)	$ 30.10
Granted, weighted average grant date fair value (in dollars per share)	33.47	$ 32.51	27.20
Vested, weighted average grant date fair value (in dollars per share)	29.81
Outstanding, end of period, weighted average grant date fair value per share (in dollars per share)	$ 32.13	$ 30.10
Restricted Stock Units (RSUs) [Member]
Number of Shares:
Outstanding, beginning balance (in shares)	0
Granted (in shares)	50,000
Vested (in shares)	(25,000)
Outstanding, ending balance (in shares)	25,000	0
Weighted Average Grant Date Fair Value per Share:
Outstanding, beginning of period, weighted average grant date fair value per share (in dollars per share)	$ 0
Granted, weighted average grant date fair value (in dollars per share)	26.47	$ 0	$ 0
Vested, weighted average grant date fair value (in dollars per share)	26.47
Outstanding, end of period, weighted average grant date fair value per share (in dollars per share)	$ 26.47	$ 0

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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