Stock-Based Compensation and Stock Awards - Performance Unit Awards - Additional Information (Detail)	12 Months Ended
Dec. 31, 2016 USD ($) Company $ / shares shares	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Unit compensation expense	$ 4,600,000	$ 4,500,000	$ 3,100,000
Performance Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share value based on Monte Carlo simulation (in dollars per share) \| $ / shares	$ 53.46	$ 79
Percentage of grant share price (as a percentage)	110.30%	120.20%
Number of components companies in the Philadelphia Oil Service Index \| Company	15
Total share return period (in years)	3 years
Income tax benefit recognized	$ 462,000	$ 1,100,000	$ 0
Unrecognized compensation expense related to share based compensation	$ 8,900,000
Period of recognition for unrecognized compensation expense related to nonvested stock options (in years)	2 years 1 month 1 day
Anti-dilutive performance share units (in shares) \| shares	64,546
Minimum [Member] \| Performance Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Participants earning under the term (as a percentage)	0.00%
Maximum [Member] \| Performance Unit Awards [Member]
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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- Definition

The period over which the performance units were valued based on a Monte Carlo simulation . Under the plan, participants may earn a rate of their target award based upon the Company's relative total share return ("TSR") in comparison to a stated index and assumes reinvestment of dividends for companies within the stated index that pay dividends,

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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- Definition

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

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