Fair Value Measurements (Gross Amounts and Fair Value of Debt) (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Term loan
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Gross value	$ 1,810,266	$ 1,810,266
Term loan | Significant Other Observable Inputs (Level 2)
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Fair value - Level 2	1,366,751	1,226,455
7.75% senior notes:
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Gross value	610,000	610,000
7.75% senior notes: | Significant Other Observable Inputs (Level 2)
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Fair value - Level 2	$ 207,400	$ 249,673