Long-Term Debt - Margin for Revolving Loans (Detail)	12 Months Ended
	Dec. 31, 2016
Greater than or Equal to 4.50 to 1.00
Debt Instrument [Line Items]
First lien net leverage ratio upper limit	4.50
First lien net leverage ratio lower limit	1.00
Greater than or Equal to 4.50 to 1.00 | LIBOR Margin
Debt Instrument [Line Items]
Margin Rate	2.50%
Greater than or Equal to 4.50 to 1.00 | Base Rate Margin
Debt Instrument [Line Items]
Margin Rate	1.50%
Less than 4.50 to 1.00
Debt Instrument [Line Items]
First lien net leverage ratio upper limit	4.50
First lien net leverage ratio lower limit	1.00
Less than 4.50 to 1.00 | LIBOR Margin
Debt Instrument [Line Items]
Margin Rate	2.25%
Less than 4.50 to 1.00 | Base Rate Margin
Debt Instrument [Line Items]
Margin Rate	1.25%