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Equity-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentageofperformancesharepayoutmeasuredbyfreeoperatingcashflow	0.00%		0.00%
Percentage of performance share payout measured by return on invested capital	30.00%		30.00%
PercentageofperformancesharepayoutADJUSTMENTmeasuredbytotalshareholderreturn	0.00%		0.00%
Share-based Payment Arrangement, Expense	$ 1,211	$ 1,552	$ 2,389	$ 3,042
Cash paid for minimum tax withholdings			$ 400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period			71,503
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price			$ 51.95
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	519,158		519,158
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 51.15		$ 51.15
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 184	377	$ 518	910
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	679	582	$ 1,181	1,004
Shares issued (in shares)			32,811
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested Shares Settled			47,264
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	348	$ 593	$ 690	1,128
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense			100	$ (2,000)
Deferred Compensation Share-based Arrangements, Liability, Classified, Noncurrent					$ 800
Deferred Compensation Cash-based Arrangements, Liability, Classified, Noncurrent	$ 1,800		$ 1,800		$ 1,300
Minimum [Member] | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Outstanding Award As Percentage Of Shares Issued	0.00%		0.00%
Maximum | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Outstanding Award As Percentage Of Shares Issued	200.00%		200.00%

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the period, but did not meet the requisite market condition performance measurement, which resulted in the vested shares settling without payment (excludes forfeited shares and vested shares deferred).

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

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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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