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Stockholders' Equity - Stock Options Outstanding and Exercisable (Detail)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
$7.86 - $8.01 [Member]
Stockholders Equity [Line Items]
Exercise prices, lower range	$ 7.86
Exercise prices, upper range	$ 8.01
Stock Options Outstanding, Shares Outstanding | shares	57,525
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	1 year 4 months 28 days
Stock Options Outstanding, Weighted-Average Exercise Price	$ 7.96
Stock Options Exercisable, Shares Outstanding | shares	37,525
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	1 year 9 months 4 days
Stock Options Exercisable, Weighted-Average Exercise Price	$ 7.94
$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 | shares	19,920
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	2 years 9 months 29 days
Stock Options Outstanding, Weighted-Average Exercise Price	$ 9.70
Stock Options Exercisable, Shares Outstanding | shares	19,920
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	2 years 9 months 29 days
Stock Options Exercisable, Weighted-Average Exercise Price	$ 9.70
$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 | shares	655,335
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	7 years 10 months 24 days
Stock Options Outstanding, Weighted-Average Exercise Price	$ 33.45
Stock Options Exercisable, Shares Outstanding | shares	195,480
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	6 years 11 months 12 days
Stock Options Exercisable, Weighted-Average Exercise Price	$ 33.88
$36.78 - $42.65 [Member]
Stockholders Equity [Line Items]
Exercise prices, lower range	36.78
Exercise prices, upper range	$ 42.65
Stock Options Outstanding, Shares Outstanding | shares	110,000
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	9 years 6 months 18 days
Stock Options Outstanding, Weighted-Average Exercise Price	$ 39.45
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	0 years
$7.86 - $42.65 [Member]
Stockholders Equity [Line Items]
Exercise prices, lower range	$ 7.86
Exercise prices, upper range	$ 42.65
Stock Options Outstanding, Shares Outstanding | shares	842,780
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	7 years 6 months 18 days
Stock Options Outstanding, Weighted-Average Exercise Price	$ 31.93
Stock Options Exercisable, Shares Outstanding | shares	252,925
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	5 years 10 months 6 days
Stock Options Exercisable, Weighted-Average Exercise Price	$ 28.13

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Stockholders equity.

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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
-Subparagraph (g)
-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 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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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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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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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 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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