Common Stock and Stock-Based Compensation Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted under stock incentive plans vesting rate, year one	25.00%
Remaining shares vesting period	36 months
Unrecognized compensation expense	$ 3,294
Unrecognized compensation expense, weighted-average period of recognition	1 year 4 months 24 days
Non Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted under stock incentive plan vesting rate, each anniversary	25.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period	4 years
Stock Appreciation Rights (SARs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted percentage	400.00%

Share Based Compensation Arrangement By Share Based Payment Award Options Annual Vesting Percentage

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Vesting Percentage Year One

+ References

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Awards Granted

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Remaining Vesting Period

+ References

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)

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

+ References

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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=6415400&loc=d3e5070-113901

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