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Assumptions Used to Estimate Fair Value of Stock Options Granted (Detail)	12 Months Ended
	Dec. 31, 2016 ExecutiveOfficers	[1]	Dec. 31, 2015 Employee ExecutiveOfficers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%		0.00%
Expected volatility, Minimum	38.00%		33.00%
Expected volatility, Maximum	49.00%		49.00%
Risk-free interest rate, Minimum	0.50%		0.20%
Risk-free interest rate, Maximum	2.40%		2.40%
Expected forfeiture (employees)			10.00%
Expected forfeiture (executives)	5.00%		5.00%
Contractual term of up to	10 years		10 years
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Suboptimal exercise multiple | Employee			2.1
Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Suboptimal exercise multiple | ExecutiveOfficers	2.4		2.4
[1] During 2016, the Company granted stock options only to its non-employee directors.

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- Definition

Share based compensation arrangement by share based payment award fair value assumptions, expected forfeiture.

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- Definition

Share based compensation arrangement by share based payment award fair value assumptions expected forfeiture for executives.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Suboptimal Exercise Factor

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ 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 (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Expected term of share-based compensation awards, 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 (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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