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Income Taxes - Summary of Provision for Income Taxes and U.S. Federal Tax Rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Jun. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Computed “expected” tax expense | $ 59,571 |  |  | $ 57,875 |  |  |
Foreign income tax differential | (4,265) |  |  | (5,860) |  |  |
Excess tax benefits related to stock-based compensation | (8,247) |  |  | 0 |  |  |
State taxes net of federal benefits | 1,678 |  |  | 2,501 |  |  |
Foreign-sourced nontaxable income | (6,691) |  |  | (2,344) |  |  |
Domestic production activities deduction | (4,282) |  |  | (7,950) |  |  |
Other | 2,822 |  |  | 4,365 |  |  |
Provision for income taxes | $ 40,586 | $ 46,095 | $ 45,822 | $ 48,587 | $ 91,917 | $ 132,503 | $ 140,695
Computed “expected” tax expense | 35.00% |  |  | 35.00% |  |  |
Foreign income tax differential | (2.50%) |  |  | (3.50%) |  |  |
Excess tax benefits related to stock-based compensation | (4.90%) |  |  | 0.00% |  |  |
State taxes net of federal benefits | 1.00% |  |  | 1.50% |  |  |
Foreign-sourced nontaxable income | (3.90%) |  |  | (1.40%) |  |  |
Domestic production activities deduction | (2.50%) |  |  | (4.80%) |  |  |
Other | 1.70% |  |  | 2.60% |  |  |
Provision for income taxes | 23.90% |  |  | 29.40% |  |  |

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