Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |
Aug. 02, 2018 |
Aug. 09, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
|---|---|---|---|---|
| Subsequent Event [Line Items] | ||||
| Dividends payable Per Share (in dollars per share) | $ 0.4220 | $ 0.4220 | ||
| Subsequent Event [Member] | ||||
| Subsequent Event [Line Items] | ||||
| Dividends payable Per Share (in dollars per share) | $ 0.4220 | |||
| Dividends annualized (in dollars per share) | $ 1.688 | |||
| Pattern Development 2.0 [Member] | ||||
| Subsequent Event [Line Items] | ||||
| Investment in related party | $ 57.1 | |||
| Pattern Development 2.0 [Member] | Subsequent Event [Member] | ||||
| Subsequent Event [Line Items] | ||||
| Investment in related party | $ 29.0 |