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Recent Accounting Standards - Line Items Adjusted in Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Accounts receivable, net $ 147,332 $ 165,364
Prepaid expenses and other current assets 32,656 19,180
Deposits and other assets 6,974 7,411
Deferred tax assets, net 12,041 9,297
Deferred revenue and advance payments 201,718 198,734
Deferred revenue and advance payments, non-current 5,668 6,400
Accumulated other comprehensive loss (4,219) (5,659)
Retained earnings $ 528,306 526,633
As Reported    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Accounts receivable, net   69,500
Prepaid expenses and other current assets   18,002
Deposits and other assets   2,868
Deferred tax assets, net   13,391
Deferred revenue and advance payments   112,649
Deferred revenue and advance payments, non-current   10,181
Accumulated other comprehensive loss   (5,968)
Retained earnings   511,755
Effect of the Adoption | ASU 2014-09    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Accounts receivable, net   95,864
Prepaid expenses and other current assets   1,178
Deposits and other assets   4,543
Deferred tax assets, net   (4,094)
Deferred revenue and advance payments   86,085
Deferred revenue and advance payments, non-current   (3,781)
Accumulated other comprehensive loss   309
Retained earnings   $ 14,878