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Summary of Significant Accounting Policies - Basic and Diluted Shares Outstanding (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted average common shares outstanding - basic (in shares)	22,383	21,901	21,505
Effect of dilutive options (in shares)	42	107	110
Weighted average common shares outstanding - diluted (in shares)	22,425	22,008	21,615
Average share price (in usd per share)	$ 52.50	$ 61.63	$ 58.96
Options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Non-dilutive options (in shares)	492	0	129

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Average Price Per Common Share

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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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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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