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Earnings Per Share - (Additional Information) (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Stock options, outstanding	985,266		985,266		998,226
Stock options, weighted average exercise price	$ 30.16		$ 30.16		$ 27.54
Common stock excluded from calculation of diluted earnings per share	119,026	551,012	180,160	615,930
Option To Purchase Common Stock [Member]
Stock options, outstanding	985,266	1,058,834	985,266	1,058,834
Stock options, weighted average exercise price	$ 30.16	$ 26.72	$ 30.16	$ 26.72
Restricted Stock Units (RSUs) [Member]
Restricted stock units, outstanding	766,986	716,996	766,986	716,996	707,413

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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