Stockholder's Equity - Stock Options Outstanding and Exercisable (Detail) (USD $)	12 Months Ended
Dec. 31, 2014
$5.10 [Member]
Stockholders Equity [Line Items]
Exercise prices, lower range	$ 5.10
Stock Options Outstanding, Shares Outstanding	7,000
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	11 months 1 day
Stock Options Outstanding, Weighted-Average Exercise Price	$ 5.10
Stock Options, Intrinsic Value of Shares Outstanding	$ 184,000
Stock Options Exercisable, Shares Outstanding	7,000
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	11 months 1 day
Stock Options Exercisable, Weighted-Average Exercise Price	$ 5.10
Stock Options Exercisable, Intrinsic Value of Shares Outstanding	184,000
$7.86 - $8.17 [Member]
Stockholders Equity [Line Items]
Exercise prices, lower range	$ 7.86
Exercise prices, upper range	$ 8.17
Stock Options Outstanding, Shares Outstanding	162,950
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	2 years 2 months 9 days
Stock Options Outstanding, Weighted-Average Exercise Price	$ 7.97
Stock Options, Intrinsic Value of Shares Outstanding	3,825,000
Stock Options Exercisable, Shares Outstanding	72,950
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	2 years 8 months 23 days
Stock Options Exercisable, Weighted-Average Exercise Price	$ 7.92
Stock Options Exercisable, Intrinsic Value of Shares Outstanding	1,716,000
$9.69 - $9.97 [Member]
Stockholders Equity [Line Items]
Exercise prices, lower range	$ 9.69
Exercise prices, upper range	$ 9.97
Stock Options Outstanding, Shares Outstanding	75,248
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	3 years 8 months 23 days
Stock Options Outstanding, Weighted-Average Exercise Price	$ 9.69
Stock Options, Intrinsic Value of Shares Outstanding	1,636,000
Stock Options Exercisable, Shares Outstanding	75,248
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	3 years 8 months 23 days
Stock Options Exercisable, Weighted-Average Exercise Price	$ 9.69
Stock Options Exercisable, Intrinsic Value of Shares Outstanding	1,636,000
$29.99 - $34.50 [Member]
Stockholders Equity [Line Items]
Exercise prices, lower range	$ 29.99
Exercise prices, upper range	$ 34.50
Stock Options Outstanding, Shares Outstanding	710,650
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	8 years 9 months 22 days
Stock Options Outstanding, Weighted-Average Exercise Price	$ 33.53
Stock Options, Intrinsic Value of Shares Outstanding	8,000
Stock Options Exercisable, Shares Outstanding	110,550
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	6 years 9 months 18 days
Stock Options Exercisable, Weighted-Average Exercise Price	$ 34.40
Stock Options Exercisable, Intrinsic Value of Shares Outstanding	4,000
$5.10 - $34.50 [Member]
Stockholders Equity [Line Items]
Exercise prices, lower range	$ 5.10
Exercise prices, upper range	$ 34.50
Stock Options Outstanding, Shares Outstanding	955,848
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	7 years 2 months 19 days
Stock Options Outstanding, Weighted-Average Exercise Price	$ 27.09
Stock Options, Intrinsic Value of Shares Outstanding	5,653,000
Stock Options Exercisable, Shares Outstanding	265,748
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	4 years 7 months 28 days
Stock Options Exercisable, Weighted-Average Exercise Price	$ 19.36
Stock Options Exercisable, Intrinsic Value of Shares Outstanding	$ 3,540,000

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

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- Definition

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

Weighted average remaining contractual term of exercisable 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

-Subparagraph (e)(2)

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

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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

-Subparagraph (g)

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

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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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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

-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

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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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

-Subparagraph (e)(1)

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

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The ceiling 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

-Subparagraph (g)

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

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