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Fair Value Measurements - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fixed payments to partner, year 2017-06  
Fixed payments to partner, year 2024-06  
Purchase of outstanding preferred shares, year 2024  
Additional paid in capital excess of cash contributed   $ 5.2
Cash contribution by partner in joint venture   3.0
Level 3 [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Joint Venture liability (level 3) $ 8.2 8.2
Other Noncurrent Liabilities | Level 3 [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Joint Venture liability (level 3) 7.2 7.2
Other current liabilities | Level 3 [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Joint Venture liability (level 3) $ 1.0 $ 1.0