The Company and Significant Accounting Policies - Margin for Revolving Loans (Detail)	6 Months Ended
	Jun. 30, 2017
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	1.0
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	1.0
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%