Stockholders' Equity - Summary of Cash Dividends Declared on Class A Common Stock (Detail) - $ / shares |
3 Months Ended | ||
|---|---|---|---|
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
|
| Dividends Payable [Line Items] | |||
| Dividends Per Share (in dollars per share) | $ 0.4000 | $ 0.3900 | $ 0.3810 |
| Declaration Date | Aug. 03, 2016 | May 04, 2016 | Feb. 24, 2016 |
| Record Date | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 |
| Payment Date | Oct. 31, 2016 | Jul. 29, 2016 | Apr. 29, 2016 |