Gross Amounts and Fair Value of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Term loan
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Carrying value	$ 1,903,875	$ 1,903,875
Term loan | Significant Other Observable Inputs (Level 2)
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Fair value - Level 2	1,875,317	1,856,278
7.75% senior notes
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Carrying 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	$ 597,800	$ 617,625