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Preferred Units - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jan. 23, 2017
Oct. 05, 2016
Mar. 31, 2017
Mar. 31, 2016
Temporary Equity [Line Items]        
Issuance and sale of Preferred Units, gross $ 150,000 $ 250,000 $ 150,054 $ 0
Preferred Units, units issued 150,000      
Number of Days After a Change in Control That an Increase In Distribution Rate Occurs     31 days  
Number Of Days After The Maturity Date Of The Revolving Credit Facility (A Condition To Effect Redemption)   91 days    
Threshold of Average Closing Price of Class A Shares     $ 15.00  
Number of Trading Days     20 days  
Preferred Units, Units Outstanding   250,000 400,000  
Maximum        
Temporary Equity [Line Items]        
Aggregate amount of Preferred Units subject to the Purchase Agreement     400,000  
Preferred Units, Liquidation Preference     $ 400,000  
Preferred Unit, Distribution Rate, Percentage     10.00%  
Minimum        
Temporary Equity [Line Items]        
Preferred Unit, Distribution Rate, Percentage     0.00%  
Through 02/18/2020 [Member]        
Temporary Equity [Line Items]        
Preferred Unit Price As A Percent Of Liquidation Value     105.00%  
Beginning 31 Days After Change In Control Event [Member]        
Temporary Equity [Line Items]        
Increase in Dividend Rate On Preferred Units     7.00%  
From 02/19/2020 Until 2/18/2021 [Member]        
Temporary Equity [Line Items]        
Preferred Unit Price As A Percent Of Liquidation Value     103.00%  
From 02/19/2021 Until 02/18/2022 [Member]        
Temporary Equity [Line Items]        
Preferred Unit Price As A Percent Of Liquidation Value     101.00%  
From And After March 31, 2020 [Member]        
Temporary Equity [Line Items]        
Threshold of Distributions That Would Cause A Portion To Be Used For Redemption     $ 100,000  
Percent of the Excess Over Threshold That Would Cause Redemption     20.00%