Components of Debt (Parenthetical) (Detail)	6 Months Ended	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
0.25% Convertible Senior Note Due 2022
Line Of Credit Facility [Line Items]
Debt instrument, interest rate	0.25%	0.25%	0.25%
0.50% Convertible Notes
Line Of Credit Facility [Line Items]
Debt instrument, interest rate	0.50%
London Interbank Offered Rate (LIBOR) | Term A Loan
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	2.00%
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	2.00%
London Interbank Offered Rate (LIBOR) | Term Loans
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate		1.75%
London Interbank Offered Rate (LIBOR) | Term B Loan Facility
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	3.50%
London Interbank Offered Rate (LIBOR) | Line of credit
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate		1.75%
London Interbank Offered Rate (LIBOR) | Yen denominated line of credit
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate		1.75%