Period of cliff vesting for option valuation.

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Period of graded vesting for option valuation.

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Range of awards of target number of share.

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Share Based Compensation Arrangement By Share Based Payment Award Accrued Liabilities

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Share based compensation arrangement by share based payment award fair value assumptions historical volatility rate.

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- Definition

Share based compensation arrangement by share based payment award fair value assumptions implied volatility rate on publicly traded options.

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Shares remaining outstanding for issuance when additional shares were reserved for issuance.

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- Definition

Term of director.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Paragraph 2
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- Definition

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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No definition available.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

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No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Net number of share options (or share units) granted during the period.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

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- Definition

Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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-Publisher FASB
-Name Accounting Standards Codification
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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting terms	Vesting terms ranging from three to five years and include 1) options that vest in one-fifth increments beginning on the grant date and continuing on each of the first four anniversaries of the grant date and 2) options that cliff-vest on the fifth anniversary of the grant date.		Vesting terms ranging from three to five years which primarily includes 1) options that vest in one-fifth increments beginning on the grant date and continuing on each of the first four anniversaries of the grant date and 2) options that cliff-vest on the fifth anniversary of the grant date.
Accrued expenses, liability			$ 15,301	$ 13,283
Period of graded vesting for option valuation			4 years
Period of cliff vesting for option valuation			5 years
Expected dividend yield			5.00%	2.00%	0.00%
Total unrecognized compensation cost related to nonvested awards			$ 9,253
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized			1 year 1 month 10 days
Number of shares available for grant under Incentive Plan			2,439,489
Aggregate intrinsic value of options outstanding			$ 43,325
Aggregate intrinsic value of options exercisable			30,258
Total intrinsic value of options exercised			$ 28,549
The Company granted options for an aggregate shares of its Class A common stock			42,000
Stock-based compensation expense	$ 3,199	$ 3,901	$ 25,890	$ 24,120	$ 24,936
1996 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant under Incentive Plan	2,278,515
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration date of options granted under equity incentive plan	10 years		10 years
Term of director	1 year
Restricted Stock [Member] \| Percentage of awards vesting on grant date [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of awards vesting on grant date	50.00%
Restricted Stock [Member] \| Percentage of Awards Vesting On Last Day of Each Directors Term [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of awards vesting on grant date	50.00%
2009 Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant under Incentive Plan	327,750		279,589	307,448
Additional shares reserved under 2009 ESPP	82,084		80,933
Common Class A [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected Volatility			90.00%
Volatility rate on publicly traded options			10.00%
The Company granted options for an aggregate shares of its Class A common stock	9,000
Common Class A [Member] \| 1996 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for issuance to directors and employees	15,500,000		15,500,000
Common Class A [Member] \| Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 32
Common Class A [Member] \| 2009 Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for issuance to directors and employees			588,154
Employee stock purchase plan, which available for issuance of common stock			88,154
Additional shares reserved under 2009 ESPP	82,084		80,933
Performance Based Compensation [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense related to performance based compensation agreements	$ 670		$ 15,301
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period	3 years		3 years
Range of awards of target number of share	0.00%		0.00%
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period	5 years		5 years
Range of awards of target number of share	100.00%		100.00%