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Income Taxes - Schedule of Differences Between Statutory Federal Income Tax Rate and Income Taxes Reported in Consolidated Statements of Operations (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
 [1]
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]                          
Federal income tax expense at the statutory rate                 21.00% 35.00% 21.00% 21.00% 28.10%
State income taxes, net of federal benefit                     0.10% 6422.10% 2.40%
Research and development credits, net of the federal tax on state credits                     1.30% (11880.90%) (1.70%)
Uncertain tax positions, net of federal benefit                     (0.90%) 9312.10% 2.10%
Uncertain tax benefits statute expired, net of federal benefit                     0.20% (22798.50%) 0.00%
Incentive stock option and employee stock purchase plan expense                     0.10% (9954.30%) (1.40%)
Foreign rate differential                     (0.30%) 2568.80% (0.70%)
Change in valuation allowance                     (1.70%) (642.20%) 0.50%
Tax Cut and Jobs Act impact                     0.00% 0.00% (26.60%)
Fair value adjustments related to acquisition contingent consideration                     (0.00%) 2568.80% (14.20%)
Non-deductible contingent purchase price and transaction costs                     0.10% 0.00% 0.00%
Non-deductible meals and entertainment                     (0.80%) 4174.40% 0.30%
Non-deductible officer compensation                     (0.70%) 1926.60% 0.00%
Asset impairment                     (5.60%) 0.00% 0.00%
Expired tax attributes                     (1.90%) 0.00% 0.00%
Non-deductible legal settlement                     0.00% 6101.00% 0.00%
Foreign disregarded election                     0.00% 20550.80% 0.00%
Changes in revenue recognition/method                     0.00% (23440.80%) 0.00%
Other, net                     (0.30%) 963.40% 0.50%
Effective income tax rate                     10.60% (14107.70%) (10.70%)
Federal income tax expense at the statutory rate                     $ (46.9)   $ 33.7
State income taxes, net of federal benefit                     (0.2) $ 2.0 2.9
Research and development credits, net of the federal tax on state credits                     (2.8) (3.7) (2.1)
Uncertain tax positions, net of federal benefit                     1.9 2.9 2.5
Uncertain tax benefits statute expired, net of federal benefit                     (0.4) (7.1)  
Incentive stock option and employee stock purchase plan expense                     (0.2) (3.1) (1.7)
Foreign rate differential                     0.7 0.8 (0.8)
Change in valuation allowance                     3.5 (0.2) 0.6
Tax Cut and Jobs Act impact                         (32.0)
Fair value adjustments related to acquisition contingent consideration                       0.8 (17.0)
Non-deductible contingent purchase price and transaction costs                     (0.3)    
Non-deductible meals and entertainment                     1.8 1.3 0.4
Non-deductible officer compensation                     1.6 0.6  
Asset impairment                     12.6    
Expired tax attributes                     4.2    
Non-deductible legal settlement                       1.9  
Foreign disregarded election                       6.4  
Changes in revenue recognition/method                       (7.3)  
Other, net                     0.8 0.3 0.5
Total income tax expense $ (3.0) $ (15.9) $ (3.1) $ (1.7) $ (3.4) $ (3.6) $ 1.0 $ 1.6     $ (23.7) $ (4.4) $ (13.0)
[1] An immaterial prior period goodwill impairment charge of $1.3 million was previously classified as part of selling, general and administrative expense in the condensed consolidated statements of operations was reclassified to conform to the current period presentation and is included as part of the goodwill and intangible asset impairment charges financial statement line item in the current period.