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Business Combinations - Purchase Price Allocation (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 13, 2016
Aug. 31, 2016
Apr. 30, 2016
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]              
Goodwill       $ 20,744,000 $ 732,540,000 $ 20,744,000 $ 20,744,000
Cash paid for acquisition, net of cash acquired         (167,859,000)   $ 7,635,000
Deferred payment arrangements value         3,100,000 3,600,000  
New York Code And Design Academy, Inc.              
Business Acquisition [Line Items]              
Cash $ 790,000            
Other assets 1,265,000            
Indefinite lived intangible assets, fair value 5,660,000            
Goodwill 13,944,000            
Liabilities assumed (4,734,000)            
Total consideration 16,925,000            
Less: contingent consideration (14,500,000)            
Less: cash acquired (790,000)            
Cash paid for acquisition, net of cash acquired 1,635,000            
Reduction in fair value of contingent consideration       $ 1,300,000 0 7,800,000  
Contingent consideration payment $ 4,600,000 $ 500,000 $ 6,000,000     0  
Deferred payment arrangements value           $ 0  
New York Code And Design Academy, Inc. | Maximum              
Business Acquisition [Line Items]              
Contingent consideration         $ 11,500,000