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Basis of Presentation - Schedule of Condensed Consolidated Statement of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2014
Jun. 30, 2014
Jun. 30, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net Loss $ (12,104) $ (8,912) $ 15,067
Changes in operating assets and liabilities:      
Refundable income taxes (8,187) (5,260)  
Net cash provided by operating activities 40,139 33,235 13,189
As Previously Reported [Member]
      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net Loss (9,890)    
Changes in operating assets and liabilities:      
Refundable income taxes (10,401)    
Net cash provided by operating activities 40,139    
Adjustment [Member]
      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net Loss (2,214)    
Changes in operating assets and liabilities:      
Refundable income taxes 2,214    
Net cash provided by operating activities