Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.19.1
Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
director
shares
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2017
USD ($)
shares
Apr. 01, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Intangible assets, net   $ 174,400,000 $ 12,300,000    
Goodwill   $ 201,100,000 $ 4,900,000    
Ownership interest rate percentage (as percent)   100.00%      
Impairment   $ 4,600,000      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   11 years 8 months 6 years 1 month    
Impairment   $ 2,600,000 $ 0 $ 0  
Equity awards vested percentage after first year   25.00%      
Equity awards vested percentage after second year   25.00%      
Equity awards vested percentage after third year   50.00%      
Deferred income taxes assets   $ 1,092,900,000 29,900,000    
Deferred tax assets, valuation allowance   267,600,000 129,600,000    
Other assets   2,900,000 4,700,000    
Cumulative effect of new accounting principle in period of adoption         $ 1,160,300,000
Discrete tax benefit $ 1,800,000        
Asset impairments   $ 15,900,000 $ 0 $ 0  
Accounting Standards Update 2016-16 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Deferred income taxes assets         1,313,000,000
Deferred tax assets, valuation allowance         148,200,000
Other assets         4,500,000
Restricted Stock Units (RSUs) [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Potential diluted common shares outstanding | shares   0 0 0  
Contingent Shares Not Expected To Vest [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Potential diluted common shares outstanding | shares   2,200,000 1,600,000 1,800,000  
Other Businesses          
Summary Of Significant Accounting Policies [Line Items]          
Goodwill     $ 4,600,000    
Impairment   $ 4,600,000 0 $ 0  
Impairment   2,200,000      
Asset impairments   $ 12,900,000 0 0  
AICF Funding          
Summary Of Significant Accounting Policies [Line Items]          
Ownership interest rate percentage (as percent)   0.00%      
Retained Earnings [Member] | Accounting Standards Update 2016-16 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Cumulative effect of new accounting principle in period of adoption         $ 1,160,300,000
AICF Funding          
Summary Of Significant Accounting Policies [Line Items]          
Number of directors appointed by Company | director   3      
AICF Funding | New South Wales, Australia [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Number of directors appointed by NSW government | director   2      
Other Accrued Liabilities [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Prior period reclassification adjustment       (2,700,000)  
Income Tax Payable          
Summary Of Significant Accounting Policies [Line Items]          
Prior period reclassification adjustment       $ 2,700,000  
Adjustment          
Summary Of Significant Accounting Policies [Line Items]          
Intangible assets, net     12,300,000    
Goodwill     $ 4,900,000    
Selling, General and Administrative Expenses | Euro Denominated Debt [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Foreign currency translation gain   $ 2,900,000      
Minimum [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   2 years      
Maximum [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   13 years