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Other Assets - Current (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
US federal tax receivables $ 15,855 $ 16,757
Prepaid advertising 923 1,100
Prepaid expenses 2,549 2,451
Prepaid taxes 3,094 1,755
Prepaid insurance 1,279 1,446
Due from related parties 3,889 3,903
Other current assets 546 645
Total $ 28,135 $ 28,057