Debt Facilities - Convertible Debt (Detail) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	Jun. 15, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,598,645	$ 1,243,699
Less amount representing debt discount and debt issuance cost		(14,642)	(2,681)
Long-term debt, net		5,450,636
Additional paid-in capital		$ 7,307,575	4,838,444
4.75% convertible subordinated notes
Debt Instrument [Line Items]
Convertible debt interest rate (in shares)	4.75%	4.75%		4.75%
Debt conversion, original debt, amount		$ 150,082
Debt conversion, converted instrument, shares issued		1,981,662
Cash		$ 3,619
Capped call premium		$ 49,664
Additional paid-in capital	$ 141,688
Conversion price per share (in dollars per share)	$ 372.10
Convertible subordinated debt | 4.75% convertible subordinated notes
Debt Instrument [Line Items]
Long-term debt, gross			150,082
Less amount representing debt discount and debt issuance cost			(3,961)
Long-term debt, net			$ 146,121
Convertible debt interest rate (in shares)		4.75%	4.75%
Common stock | 4.75% convertible subordinated notes
Debt Instrument [Line Items]
Debt conversion, converted instrument, shares issued	380,779