Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Immediately vested stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock granted (in shares)	33,487	25,000
Restricted stock awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock granted (in shares)		136,000
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures	$ 1.3
Weighted-average period over which unrecognized compensation expense is expected to be recognized	1 year 4 months 25 days
Restricted stock units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock granted (in shares)	16,667
Vesting period	8 days
Stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted in period (in shares)	0	0
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures	$ 0.4
Weighted-average period over which unrecognized compensation expense is expected to be recognized	1 year 7 months 25 days
Minimum \| Restricted stock awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	2 years	2 years
Minimum \| Stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	2 years	2 years
Maximum \| Restricted stock awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years	3 years
Maximum \| Stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years	3 years

Unrecognized cost of unvested share-based compensation awards.

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=96867065&loc=d3e5070-113901

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- Definition

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

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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 (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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

Gross number of share options (or share units) granted during the period.

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