Acquisitions - Additional Information (Detail) $ in Thousands			6 Months Ended		12 Months Ended
	Jul. 15, 2015 USD ($) Center	May 19, 2015 USD ($) Center	Jun. 30, 2016 USD ($) Center	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Center Business	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 1,135,748		$ 1,147,809	$ 1,095,738
Hildebrandt Learning Centers, LLC [Member]
Business Acquisition [Line Items]
Cash consideration		$ 19,200
Contingent consideration acquired		500
Goodwill		13,200
Intangible assets including customer relationship		$ 5,700
Amortization period of intangible assets		12 years
Working capital acquired (deficit)		$ 300
Cash acquired from acquisition		1,500
Fixed assets acquired		$ 500
Revenue of acquiree since acquisition date				$ 4,000
Active Learning Childcare Limited [Member]
Business Acquisition [Line Items]
Number of centers acquired | Center	9
Cash consideration	$ 42,200
Goodwill	31,100
Intangible assets including customer relationship	$ 3,800
Amortization period of intangible assets	5 years
Working capital acquired (deficit)	$ (1,800)
Cash acquired from acquisition	2,800
Fixed assets acquired	9,800
Deferred tax assets	$ (700)
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Number of businesses acquired | Business					6
Cash consideration			2,200		$ 20,500
Contingent consideration acquired					800
Goodwill			1,900		18,500
Intangible assets including customer relationship			$ 600		$ 2,700
Amortization period of intangible assets			5 years		5 years
Working capital acquired (deficit)			$ (300)
Cash acquired from acquisition					$ 300
Proceeds from contingent consideration			$ 800
UNITED STATES | Hildebrandt Learning Centers, LLC [Member]
Business Acquisition [Line Items]
Number of centers acquired | Center		40
UNITED STATES | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Number of centers acquired | Center					4
UNITED KINGDOM | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Number of centers acquired | Center			3		4