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Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2015 shares | Dec. 31, 2014 shares | Dec. 31, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options granted | 2,595,000 | 0 | 0
Restricted stock units vest description | 349,518 of these restricted stock units vest and convert into shares of our common stock after one year from the date of grant. 2,331,250 of these restricted stock units vest and convert into shares of our common stock over a three year period from the date of grant: one-third of the award will vest on each grant date anniversary following the grant. The remaining restricted units granted vest upon the attainment of certain performance goals established by the Compensation Committee or the Single Member Committee established under our 2006 Equity Incentive Plan and our 2013 Equity Incentive Plan. |  |
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of restricted units would vest over vesting period | 349,518 |  |
Restricted stock units vest and convert into shares of our common stock | 1 year |  |
Restricted Stock Two [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of restricted units would vest over vesting period | 2,331,250 |  |
Restricted stock units vest and convert into shares of our common stock | 3 years |  |
Restricted stock units vested description after specified period | 0.333 |  |
Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of RSUs, Granted | 7,540,768 |  |
Unvested stock options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options granted | 2,595,000 |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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