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Fair Value Measurement - Carrying Amounts and Fair Values of Long-Term Debt Obligations (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion of long term debt $ 3,191 $ 0
Long-term debt 163,758 233,154
Senior Notes | 7.875% senior secured notes due April 15, 2019    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Amount 0 233,154
Fair Value 0 231,391
Secured Debt | Term loan and security agreement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Amount 166,949 0
Fair Value 169,972 $ 0
Current portion of long term debt 3,200  
Long-term debt $ 163,800