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Stockholders' Equity - Stock Options Outstanding and Exercisable (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares
$7.86 [Member]
Stockholders Equity [Line Items]
Exercise prices, lower range	$ 7.86
Stock Options Outstanding, Shares Outstanding | shares	17,525
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	11 months 1 day
Stock Options Outstanding, Weighted-Average Exercise Price	$ 7.86
Stock Options, Intrinsic Value of Shares Outstanding | $	$ 15,773
Stock Options Exercisable, Shares Outstanding | shares	17,525
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	11 months 1 day
Stock Options Exercisable, Weighted-Average Exercise Price	$ 7.86
Stock Options Exercisable, Intrinsic Value of Shares Outstanding | $	$ 15,773
$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	10,685
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	9 months 29 days
Stock Options Outstanding, Weighted-Average Exercise Price	$ 9.70
Stock Options Exercisable, Shares Outstanding | shares	10,685
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	9 months 29 days
Stock Options Exercisable, Weighted-Average Exercise Price	$ 9.70
$33.36 - $34.50 [Member]
Stockholders Equity [Line Items]
Exercise prices, lower range	33.36
Exercise prices, upper range	$ 34.50
Stock Options Outstanding, Shares Outstanding | shares	178,000
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	5 years 9 months 7 days
Stock Options Outstanding, Weighted-Average Exercise Price	$ 33.80
Stock Options Exercisable, Shares Outstanding | shares	123,000
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	5 years 3 months 4 days
Stock Options Exercisable, Weighted-Average Exercise Price	$ 33.99
$7.86 - $34.50 [Member]
Stockholders Equity [Line Items]
Exercise prices, lower range	7.86
Exercise prices, upper range	$ 34.50
Stock Options Outstanding, Shares Outstanding | shares	206,210
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years	5 years 1 month 6 days
Stock Options Outstanding, Weighted-Average Exercise Price	$ 30.34
Stock Options, Intrinsic Value of Shares Outstanding | $	$ 15,773
Stock Options Exercisable, Shares Outstanding | shares	151,210
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years	4 years 5 months 9 days
Stock Options Exercisable, Weighted-Average Exercise Price	$ 29.25
Stock Options Exercisable, Intrinsic Value of Shares Outstanding | $	$ 15,773

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Stockholders equity.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options 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
-URI http://asc.fasb.org/extlink&oid=96867065&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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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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
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
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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.

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

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-Publisher FASB
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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.

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