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Unamortized Stock-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 1,457	$ 1,263	$ 4,235	$ 3,585
Unamortized Stock-Based Compensation	9,020	6,539	$ 9,020	6,539
Remaining Weighted Average Period (years)			2 years
Unamortized Stock-Based Compensation	6,206		$ 6,206
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 966	$ 635	$ 2,716	$ 2,068
Remaining Weighted Average Period (years)	2 years	1 year 2 months 12 days	2 years	1 year 2 months 12 days
Unamortized Stock-Based Compensation	$ 6,206	$ 4,475	$ 6,206	$ 4,475
Performance Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 491	$ 299	$ 1,519	$ 920
Remaining Weighted Average Period (years)	2 years	2 years	2 years	2 years
Unamortized Stock-Based Compensation	$ 2,814	$ 1,901	$ 2,814	$ 1,901
Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation		$ 80		$ 250
Remaining Weighted Average Period (years)		3 months 18 days		3 months 18 days
Unamortized Stock-Based Compensation		$ 94		$ 94
Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation		$ 249		$ 347
Remaining Weighted Average Period (years)		3 months 18 days		3 months 18 days
Unamortized Stock-Based Compensation		$ 69		$ 69

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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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.

+ References

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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