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Financial Instruments and Fair Value Measurements - Carrying Value and Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Carrying Amounts and Fair Values of Financial Instruments [Line Items]    
Interest rate swap $ 1,421 $ 1,964
Carrying Amount    
Carrying Amounts and Fair Values of Financial Instruments [Line Items]    
Interest rate swap 1,421 1,964
Carrying Amount | Credit Facility | Senior secured Term B loan    
Carrying Amounts and Fair Values of Financial Instruments [Line Items]    
Senior secured term loan 377,642 378,074
Carrying Amount | Credit Facility | Term A due on April 17, 2018    
Carrying Amounts and Fair Values of Financial Instruments [Line Items]    
Senior secured term loan 28,307 28,721
Carrying Amount | Credit Facility | Term A due January 17, 2020    
Carrying Amounts and Fair Values of Financial Instruments [Line Items]    
Senior secured term loan 209,659 212,661
Fair Value    
Carrying Amounts and Fair Values of Financial Instruments [Line Items]    
Interest rate swap 1,421 1,964
Fair Value | Credit Facility | Senior secured Term B loan    
Carrying Amounts and Fair Values of Financial Instruments [Line Items]    
Senior secured term loan 383,318 383,491
Fair Value | Credit Facility | Term A due on April 17, 2018    
Carrying Amounts and Fair Values of Financial Instruments [Line Items]    
Senior secured term loan 28,727 29,268
Fair Value | Credit Facility | Term A due January 17, 2020    
Carrying Amounts and Fair Values of Financial Instruments [Line Items]    
Senior secured term loan $ 211,280 $ 213,872