Stock-Based Compensation - Summary of Outstanding Stock Options by Exercise Price Range (Detail) (USD $)	12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares)	1,546,500
Weighted- Average Remaining Contractual Life (in years)	3 years 6 months 0 days
Weighted- Average Exercise Price (in dollars per share)	$ 11.62
Number of Options (in shares)	1,546,500
Weighted- Average Exercise Price (in dollars per share)	$ 11.62
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 2.76
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 27.57
$ 3.55 - $ 5.51
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares)	296,500
Weighted- Average Remaining Contractual Life (in years)	7 years 7 months 15 days
Weighted- Average Exercise Price (in dollars per share)	$ 4.57
Number of Options (in shares)	296,500
Weighted- Average Exercise Price (in dollars per share)	$ 4.57
$ 3.55 - $ 5.51 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 3.55
$ 3.55 - $ 5.51 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 5.51
$ 5.52 - $11.03
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares)	735,875
Weighted- Average Remaining Contractual Life (in years)	3 years 1 month 0 days
Weighted- Average Exercise Price (in dollars per share)	$ 8.94
Number of Options (in shares)	735,875
Weighted- Average Exercise Price (in dollars per share)	$ 8.94
$ 5.52 - $11.03 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 5.52
$ 5.52 - $11.03 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 11.03
$11.04 - $22.06
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares)	267,250
Weighted- Average Remaining Contractual Life (in years)	1 year 2 months 12 days
Weighted- Average Exercise Price (in dollars per share)	$ 14.57
Number of Options (in shares)	267,250
Weighted- Average Exercise Price (in dollars per share)	$ 14.57
$11.04 - $22.06 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 11.04
$11.04 - $22.06 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 22.06
$22.07 - $27.57
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares)	246,875
Weighted- Average Remaining Contractual Life (in years)	1 year 11 months 5 days
Weighted- Average Exercise Price (in dollars per share)	$ 24.87
Number of Options (in shares)	246,875
Weighted- Average Exercise Price (in dollars per share)	$ 24.87
$22.07 - $27.57 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 22.07
$22.07 - $27.57 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 27.57

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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)(iii)

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

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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)(iii)

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

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

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

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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)(i)-(ii)

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

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- Definition

Weighted average remaining contractual term of outstanding stock options, 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

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

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