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Recent Accounting Standards - Line Items Adjusted in Consolidated Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Net income $ 1,673 $ 15,557
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,298 4,491
Deferred taxes (2,662) (968)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (3,783) (270)
Deposits and other assets 228 98
Accrued compensation and employee benefits (8,085) (11,296)
Deferred revenue and advance payments $ 19,570 22,294
As Reported    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Net income   14,867
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization   3,818
Deferred taxes   (1,812)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets   (58)
Deposits and other assets   75
Accrued compensation and employee benefits   (10,795)
Deferred revenue and advance payments   23,811
Effect of the Adoption | ASU 2014-09    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Net income   690
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization   673
Deferred taxes   844
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets   (212)
Deposits and other assets   23
Accrued compensation and employee benefits   (501)
Deferred revenue and advance payments   $ (1,517)