Stock-Based Compensation Expense - Additional Information (Detail)
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12 Months Ended |
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May. 14, 2015
USD ($)
shares
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May. 22, 2014
USD ($)
shares
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May. 09, 2013
USD ($)
shares
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Dec. 31, 2015
USD ($)
Installment
$ / shares
shares
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Dec. 31, 2014
USD ($)
Installment
$ / shares
shares
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Dec. 31, 2013
USD ($)
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Dec. 31, 2011
USD ($)
shares
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Sep. 16, 2011 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
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4 years
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| Maximum contractual term |
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10 years
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| Stock-based compensation expense | $ |
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$ 21,033,000
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$ 17,638,000
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$ 10,804,000
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| Tax benefits related to non-cash stock-based compensation awards | $ |
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8,400,000
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$ 7,100,000
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$ 4,100,000
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| Unrecognized compensation expense | $ |
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$ 5,900,000
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| Weighted average remaining life for recognition of unrecognized compensation expense |
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2 years 5 months 23 days
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| Non Employee Directors |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Grant date fair value | $ |
$ 600,000
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$ 600,000
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$ 600,000
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| President and Chief Executive Officer | Corporate Expenses |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Accelerated stock compensation costs | $ |
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$ 8,700,000
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| Equity Incentive Plan 2011 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percentage of vesting stock based compensation, second anniversary |
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30.00%
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| Percentage of vesting stock based compensation, fourth anniversary |
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20.00%
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| Total awards of shares under equity incentive plan |
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35,000,000
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| Options outstanding |
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25,313,400
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| Options outstanding, unvested |
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5,806,580
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| Options outstanding, vested |
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19,506,820
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| Equity Incentive Plan 2011 | First and second anniversaries |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting percentage |
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30.00%
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30.00%
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| Equity Incentive Plan 2011 | Third and fourth anniversaries |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting percentage |
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20.00%
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20.00%
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| Equity Incentive Plan 2011 | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding exercise price | $ / shares |
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$ 0.48
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| Equity Incentive Plan 2011 | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding exercise price | $ / shares |
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$ 6.46
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| Equity Incentive Plan 2008 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding |
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407,438
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| Options outstanding exercise price range, lower limit | $ / shares |
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$ 2.54
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| Options outstanding exercise price range, upper limit | $ / shares |
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$ 3.30
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| Restricted Stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares of restricted Class A common stock |
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4,700,000.0
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800,000.0
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| Grant date fair value | $ |
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$ 2,200,000
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$ 3,200,000
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| Exercise price | $ / shares |
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$ 2.47
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| Shares of restricted Class A common stock |
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242,916
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| Total fair value of restricted stock awards vested | $ |
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$ 600,000
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$ 600,000
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| Restricted Stock | Officers and Members of the Board |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of annual award vesting installments | Installment |
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4
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4
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| Percentage of vesting stock based compensation, second anniversary |
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50.00%
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| Restricted Stock | First and second anniversaries | Officers and Members of the Board |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of annual award vesting installments | Installment |
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2
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2
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| Restricted Stock | Third and fourth anniversaries | Officers and Members of the Board |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of annual award vesting installments | Installment |
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2
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2
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| Restricted Stock | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price | $ / shares |
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$ 0.48
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$ 3.5
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| Restricted Stock | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price | $ / shares |
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$ 4.34
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$ 7.74
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| Restricted Class Common Stock | Non Employee Directors |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
1 year
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1 year
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1 year
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| Shares of restricted Class A common stock |
242,916
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93,312
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168,540
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| Equity Incentive Plans |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares of common stock that remain authorized, reserved and available for issuance, not including shares underlying outstanding grants |
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3,300,000
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| Incentive Stock Options | Equity Incentive Plan 2011 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares of Class A common stock issued or transferred upon exercise of incentive stock options |
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17,500,000
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| Restricted stock, Restricted Stock Units, Performance Shares, Performance Units and Other Awards | Equity Incentive Plan 2011 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares of Class A common stock issued as restricted stock, RSUs, performance shares, performance units and other awards |
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12,000,000
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| Stock Appreciation Rights and Stock Options |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Earliest vesting period after grant date except in the event of retirement death or disability |
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3 years
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| Earliest vesting period after grant date if management objectives are achieved |
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1 year
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| Stock Appreciation Rights and Stock Options | Equity Incentive Plan 2011 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Grant date fair value of stock options or SAR's available for grant to a participant |
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11,500,000
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| Performance Based Compensation | Equity Incentive Plan 2011 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Grant date fair value of stock options or SAR's available for grant to a participant |
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3,000,000
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| Grant date fair value of stock options or SAR's available for grant to a participant | $ |
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$ 5,000,000
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| RSUs |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Earliest vesting period after grant date except in the event of retirement death or disability |
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3 years
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| Earliest vesting period after grant date if management objectives are achieved |
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1 year
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