Revenue - Schedule of Revenues Disaggregated by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 365,765	$ 323,687	$ 1,183,735	$ 994,422
North America
Disaggregation Of Revenue [Line Items]
Revenues, net	255,281	223,677	819,007	695,397
Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	72,394	60,665	236,518	179,580
United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	25,356	25,473	84,850	75,907
Other
Disaggregation Of Revenue [Line Items]
Revenues, net	12,734	13,872	43,360	43,538
Digital Subscription Revenues
Disaggregation Of Revenue [Line Items]
Revenues, net	143,299	107,587	432,863	312,710
Digital Subscription Revenues | North America
Disaggregation Of Revenue [Line Items]
Revenues, net	95,664	71,294	289,002	212,976
Digital Subscription Revenues | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	37,928	27,746	113,431	74,989
Digital Subscription Revenues | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	6,282	5,687	19,800	15,887
Digital Subscription Revenues | Other
Disaggregation Of Revenue [Line Items]
Revenues, net	3,425	2,860	10,630	8,858
Digital + Studio Fees
Disaggregation Of Revenue [Line Items]
Revenues, net	168,664	165,632	551,499	504,986
Digital + Studio Fees | North America
Disaggregation Of Revenue [Line Items]
Revenues, net	125,282	122,441	408,200	376,106
Digital + Studio Fees | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	25,441	23,412	83,923	70,176
Digital + Studio Fees | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	12,619	13,306	41,552	39,448
Digital + Studio Fees | Other
Disaggregation Of Revenue [Line Items]
Revenues, net	5,322	6,473	17,824	19,256
Service revenues, net
Disaggregation Of Revenue [Line Items]
Revenues, net	311,963	273,219	984,362	817,696
Service revenues, net | North America
Disaggregation Of Revenue [Line Items]
Revenues, net	220,946	193,735	697,202	589,082
Service revenues, net | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	63,369	51,158	197,354	145,165
Service revenues, net | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	18,901	18,993	61,352	55,335
Service revenues, net | Other
Disaggregation Of Revenue [Line Items]
Revenues, net	8,747	9,333	28,454	28,114
Product sales and other, net
Disaggregation Of Revenue [Line Items]
Revenues, net	53,802	50,468	199,373	176,726
Product sales and other, net | North America
Disaggregation Of Revenue [Line Items]
Revenues, net	34,335	29,942	121,805	106,315
Product sales and other, net | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues, net	9,025	9,507	39,164	34,415
Product sales and other, net | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues, net	6,455	6,480	23,498	20,572
Product sales and other, net | Other
Disaggregation Of Revenue [Line Items]
Revenues, net	$ 3,987	$ 4,539	$ 14,906	$ 15,424