Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Cumulative Effect of Adoption of ASUs on the Consolidated Balance Sheet (Details)

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Summary of Significant Accounting Policies - Cumulative Effect of Adoption of ASUs on the Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Assets      
Prepaid expenses and other current assets $ 138,015 $ 137,931 $ 129,669
Other long-term assets 128,543 121,247 118,671
Deferred tax assets 371,303 499,613 505,528
Liabilities:      
Accounts payable and accrued expenses 871,373 826,740 794,341
Current portion of deferred revenue 1,935,326 1,839,923 1,881,825
Deferred revenue 160,286 170,589 174,579
Equity:      
Accumulated deficit (2,647,277) (3,229,070) (3,243,473)
Accumulated other comprehensive income, net of tax $ 4,594 22,420 18,407
Adjustments Due to ASU 2018-02      
Assets      
Prepaid expenses and other current assets   0  
Other long-term assets   0  
Deferred tax assets   0  
Liabilities:      
Accounts payable and accrued expenses   0  
Current portion of deferred revenue   0  
Deferred revenue   0  
Equity:      
Accumulated deficit   (4,013)  
Accumulated other comprehensive income, net of tax   4,013  
Balances Without Adoption of ASU 2014-09      
Assets      
Prepaid expenses and other current assets     129,669
Other long-term assets     118,671
Deferred tax assets     505,528
Liabilities:      
Accounts payable and accrued expenses     794,341
Current portion of deferred revenue     1,881,825
Deferred revenue     174,579
Equity:      
Accumulated deficit     (3,243,473)
Accumulated other comprehensive income, net of tax     $ 18,407
Impact of Adopting ASU 2014-09 | Adjustments Due to ASU 2014-09      
Assets      
Prepaid expenses and other current assets   8,262  
Other long-term assets   2,576  
Deferred tax assets   (5,915)  
Liabilities:      
Accounts payable and accrued expenses   32,399  
Current portion of deferred revenue   (41,902)  
Deferred revenue   (3,990)  
Equity:      
Accumulated deficit   18,416  
Accumulated other comprehensive income, net of tax   $ 0