Partnership Distributions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
Jan. 27, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Distribution Made to Limited Partner [Line Items] | ||||
| Cash distribution, declared per share | $ 1.9800 | $ 1.7400 | $ 0.2825 | |
| Subsequent Event [Member] | Dividend Declared on January 27, 2016 [Member] | ||||
| Distribution Made to Limited Partner [Line Items] | ||||
| Cash distribution, declared value | $ 11.1 | |||
| Cash distribution, declared per share | $ 0.5175 | |||
| Subsequent Event [Member] | Incentive Distribution Rights [Member] | Dividend Declared on January 27, 2016 [Member] | ||||
| Distribution Made to Limited Partner [Line Items] | ||||
| Cash distribution, declared value | $ 0.2 | |||