Income Taxes - Schedule of Reconciliations of Statutory U.S. Federal Income Tax to Effective Income Tax for Operations - Parenthetical (Detail) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Income Tax [Line Items] | |||
| Statutory U.S. federal income tax, Rate | 35.00% | 35.00% | 35.00% |