Stock-Based Compensation and Stock Awards - Performance Unit Awards - Additional Information (Detail) - Performance Unit Awards $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($) component $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date price (in dollars per share) \| $ / shares	$ 43.09	$ 41.50	$ 48.45
Percentage of grant share price (as a percentage)	126.80%	131.70%	110.30%
Number of components companies in the Philadelphia Oil Service Index \| component	15
Performance unit compensation expense	$ 4.2	$ 5.4	$ 4.6
Income tax benefit recognized	0.4	$ 0.8	$ 0.5
Unrecognized compensation expense related to share based compensation	$ 9.6
Period of recognition for unrecognized compensation expense related to nonvested stock options (in years)	2 years 1 month 6 days
Anti-dilutive performance share units (in shares) \| shares	169,354	160,000	64,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Participants earning under the term (as a percentage)	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Participants earning under the term (as a percentage)	200.00%

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Performance Stock Units Expense

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Range in percentage that the participants may earn of their target award.

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Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Market Price At Which Eligible Employees Are Granted Options To Purchase Shares

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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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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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Price of a single share of a number of saleable stocks of a company.

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