Schedule of Dividends Authorized and Declared Cash Dividends to Common Stockholders (Detail) - $ / shares |
6 Months Ended | ||
|---|---|---|---|
Jun. 30, 2017 |
Apr. 26, 2017 |
Jan. 31, 2017 |
|
| Dividends Payable [Line Items] | |||
| Dividend Amount Per Share of Common Stock | $ 0.227 | $ 0.227 | |
| Installment First Quarter Of Fiscal Year | |||
| Dividends Payable [Line Items] | |||
| Declaration Date | Jan. 31, 2017 | ||
| Payment Date | Mar. 15, 2017 | ||
| Record Date (close of business) | Mar. 01, 2017 | ||
| Installment Second Quarter Of Fiscal Year | |||
| Dividends Payable [Line Items] | |||
| Declaration Date | Apr. 26, 2017 | ||
| Payment Date | May 31, 2017 | ||
| Record Date (close of business) | May 17, 2017 |