Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Partnership's Financial Instruments (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 |
Financial assets, Carrying amount | | | | |
Cash and cash equivalents, Carrying amount | $ 20.6 | $ 55.9 | $ 36.3 | $ 54.5 |
Restricted cash, Carrying amount | 1.7 | 3 | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 11.4 | 11 | | |
Non-current forward currency exchange contracts, Carrying amount | 19.2 | 22.9 | | |
Financial assets, Fair value | | | | |
Cash and cash equivalents, Fair Value | 20.6 | 55.9 | | |
Current interest rate swap/forward foreign exchange contracts Fair value | 11.4 | 11 | | |
Non-current forward currency exchange contracts, Fair value | 19.2 | 22.9 | | |
Financial liabilities, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 6.3 | 5.1 | | |
Non-current interest rate swap/forward foreign exchange contracts, Carrying amount | 5.4 | 5.8 | | |
Long-term debt, Carrying amount | 695.9 | 691.8 | | |
Current installments of long-term debt, Carrying amount | 6 | 8.9 | | |
Long-term debt | 689.9 | 682.9 | | |
Financial liabilities, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts, Fair value | 6.3 | 5.1 | | |
Non-current interest rate swap/forward foreign exchange contracts, Fair value | 5.4 | 5.8 | | |
Non Affiliated Entity [Member] | | | | |
Financial liabilities, Carrying amount | | | | |
Long-term debt | 554 | 541.6 | | |
Affiliates [Member] | | | | |
Financial liabilities, Carrying amount | | | | |
Long-term debt | 135.9 | 141.3 | | |
Foreign Exchange Forward [Member] | | | | |
Financial assets, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 11.3 | 11 | | |
Non-current forward currency exchange contracts, Carrying amount | 19.2 | 22.9 | | |
Financial assets, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts Fair value | 11.3 | 11 | | |
Non-current forward currency exchange contracts, Fair value | 19.2 | 22.9 | | |
Financial liabilities, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 1.1 | 0 | | |
Non-current interest rate swap/forward foreign exchange contracts, Carrying amount | 2.1 | 0 | | |
Financial liabilities, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts, Fair value | 1.1 | 0 | | |
Non-current interest rate swap/forward foreign exchange contracts, Fair value | 2.1 | 0 | | |
Interest Rate Swap Contracts [Member] | | | | |
Financial assets, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 0.1 | 0 | | |
Non-current forward currency exchange contracts, Carrying amount | 0 | 0 | | |
Financial assets, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts Fair value | 0.1 | 0 | | |
Non-current forward currency exchange contracts, Fair value | 0 | 0 | | |
Financial liabilities, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 5.3 | 5.1 | | |
Non-current interest rate swap/forward foreign exchange contracts, Carrying amount | 3.3 | 5.8 | | |
Financial liabilities, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts, Fair value | 5.3 | 5.1 | | |
Non-current interest rate swap/forward foreign exchange contracts, Fair value | 3.3 | 5.8 | | |
Variable Rate [Member] | Non Affiliated Entity [Member] | | | | |
Financial liabilities, Fair value | | | | |
Long-term debt, Fair value | 122.2 | 104 | | |
Variable Rate [Member] | Affiliates [Member] | | | | |
Financial liabilities, Fair value | | | | |
Long-term debt, Fair value | 141.9 | 150.2 | | |
Fixed Rate [Member] | Non Affiliated Entity [Member] | | | | |
Financial liabilities, Fair value | | | | |
Long-term debt, Fair value | 454.7 | 443.1 | | |
Reported Value Measurement [Member] | | | | |
Financial assets, Carrying amount | | | | |
Cash and cash equivalents, Carrying amount | 20.6 | 55.9 | | |
Restricted cash, Carrying amount | 1.7 | 3 | | |
Reported Value Measurement [Member] | Affiliates [Member] | | | | |
Financial liabilities, Carrying amount | | | | |
Current installments of long-term debt, Carrying amount | 6 | 8.9 | | |
Long-term debt | 135.9 | 141.3 | | |
Reported Value Measurement [Member] | Foreign Exchange Forward [Member] | | | | |
Financial assets, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 11.3 | 11 | | |
Non-current forward currency exchange contracts, Carrying amount | 19.2 | 22.9 | | |
Financial assets, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts Fair value | 11.3 | 11 | | |
Non-current forward currency exchange contracts, Fair value | 19.2 | 22.9 | | |
Financial liabilities, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 1.1 | 0 | | |
Non-current interest rate swap/forward foreign exchange contracts, Carrying amount | 2.1 | 0 | | |
Financial liabilities, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts, Fair value | 1.1 | 0 | | |
Non-current interest rate swap/forward foreign exchange contracts, Fair value | 2.1 | 0 | | |
Reported Value Measurement [Member] | Interest Rate Swap Contracts [Member] | | | | |
Financial assets, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 0.1 | 0 | | |
Financial assets, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts Fair value | 0.1 | 0 | | |
Financial liabilities, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 5.3 | 5.1 | | |
Non-current interest rate swap/forward foreign exchange contracts, Carrying amount | 3.3 | 5.8 | | |
Financial liabilities, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts, Fair value | 5.3 | 5.1 | | |
Non-current interest rate swap/forward foreign exchange contracts, Fair value | 3.3 | 5.8 | | |
Reported Value Measurement [Member] | Variable Rate [Member] | Non Affiliated Entity [Member] | | | | |
Financial liabilities, Carrying amount | | | | |
Long-term debt, Carrying amount | 122.2 | 104 | | |
Reported Value Measurement [Member] | Fixed Rate [Member] | Non Affiliated Entity [Member] | | | | |
Financial liabilities, Carrying amount | | | | |
Long-term debt, Carrying amount | 434.7 | 441 | | |
Estimate of Fair Value Measurement [Member] | | | | |
Financial assets, Fair value | | | | |
Cash and cash equivalents, Fair Value | 20.6 | 55.9 | | |
Restricted cash, Fair value | 1.7 | 3 | | |
Estimate of Fair Value Measurement [Member] | Affiliates [Member] | | | | |
Financial liabilities, Fair value | | | | |
Current installments of long-term debt, Fair value | 6 | 8.9 | | |
Long-term debt, excluding current installments, Fair value | 135.9 | 141.3 | | |
Estimate of Fair Value Measurement [Member] | Foreign Exchange Forward [Member] | | | | |
Financial assets, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 11.3 | 11 | | |
Non-current forward currency exchange contracts, Carrying amount | 19.2 | 22.9 | | |
Financial assets, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts Fair value | 11.3 | 11 | | |
Non-current forward currency exchange contracts, Fair value | 19.2 | 22.9 | | |
Financial liabilities, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 1.1 | 0 | | |
Non-current interest rate swap/forward foreign exchange contracts, Carrying amount | 2.1 | 0 | | |
Financial liabilities, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts, Fair value | 1.1 | 0 | | |
Non-current interest rate swap/forward foreign exchange contracts, Fair value | 2.1 | 0 | | |
Estimate of Fair Value Measurement [Member] | Interest Rate Swap Contracts [Member] | | | | |
Financial assets, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 0.1 | 0 | | |
Financial assets, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts Fair value | 0.1 | 0 | | |
Financial liabilities, Carrying amount | | | | |
Current interest rate swap/forward foreign exchange contracts, Carrying amount | 5.3 | 5.1 | | |
Non-current interest rate swap/forward foreign exchange contracts, Carrying amount | 3.3 | 5.8 | | |
Financial liabilities, Fair value | | | | |
Current interest rate swap/forward foreign exchange contracts, Fair value | 5.3 | 5.1 | | |
Non-current interest rate swap/forward foreign exchange contracts, Fair value | 3.3 | 5.8 | | |
Estimate of Fair Value Measurement [Member] | Variable Rate [Member] | Non Affiliated Entity [Member] | | | | |
Financial liabilities, Fair value | | | | |
Long-term debt, Fair value | 122.2 | 104 | | |
Estimate of Fair Value Measurement [Member] | Fixed Rate [Member] | Non Affiliated Entity [Member] | | | | |
Financial liabilities, Fair value | | | | |
Long-term debt, Fair value | $ 454.7 | $ 443.1 | | |