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.

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

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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

Number of share instruments newly issued under a share-based compensation plan.

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Number of shares for which recognition of compensation cost was accelerated.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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No definition available.

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- Definition

Number of shares related to Restricted Stock Award forfeited during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(29))
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Stock-Based Compensation - Restricted Stock - Service-Based - Additional Information (Detail) - Service Based Restricted Stock [Member] - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants vesting period				4 years
Stock awards issued during the period		285,000
Restricted shares vested grant date intrinsic value	$ 1.3		$ 0.6	$ 2.5	$ 1.0
Accelerated vesting of restricted shares				7,387
Unrecognized compensation expense	$ 3.3			$ 3.3
Weighted average period				1 year 4 months 25 days
Non Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cancelled unvested restricted shares				37,793
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants vesting period		2 years