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Stock-Based Compensation - Summary of Changes in Unvested Options (Detail) (USD $)	3 Months Ended
	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average exercise price per share, Beginning balance	$ 19.70
Weighted-average exercise price per share, Granted
Weighted-average exercise price per share, Ending balance	$ 19.85
Unvested stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, Beginning balance	51,466
Number of options, Granted
Number of options, Vested	(11,896)
Number of options, Cancelled	(473)
Number of options, Ending balance	39,097
Weighted-average exercise price per share, Beginning balance	$ 10.61
Weighted-average exercise price per share, Granted
Weighted-average exercise price per share, Vested	$ 11.40
Weighted-average exercise price per share, Cancelled	$ 10.76
Weighted-average exercise price per share, Ending balance	$ 10.37
Weighted-average grant date fair value per option, Beginning balance	$ 8.45
Weighted-average grant date fair value per option, Granted
Weighted-average grant date fair value per option, Vested	$ 9.14
Weighted-average grant date fair value per option, Cancelled	$ 7.82
Weighted-average grant date fair value per option, Ending balance	$ 8.25

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Option Equity Instruments Forfeitures

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Share based compensation arrangement by share based payment award options cancelled in period weighted average grant date fair value.

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Share based compensation arrangement by share based payment award options vested in period weighted average grant date fair value.

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Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Grant Date Fair Values

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- Definition

Share based compensation arrangements by share based payment award options vested in period weighted average exercise price.

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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=6415400&loc=d3e5070-113901

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- Definition

Weighted average price of options that were either forfeited or expired.

+ 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)(1)(iv)(3)-(4)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Number of non-vested options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Number of options vested.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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