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Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense (Detail)
$ in Thousands
Mar. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Remaining 2018 $ 5,821
2019 20,708
2020 18,341
2021 16,569
2022 14,353
2023 and thereafter 51,340
Software Developed Other Than For Internal Use [Member]  
Finite-Lived Intangible Assets [Line Items]  
Remaining 2018 738
2019 2,955
2020 2,955
2021 2,955
2022 2,955
2023 and thereafter 97
Software [Member]  
Finite-Lived Intangible Assets [Line Items]  
Remaining 2018 2,223
2019 7,992
2020 6,277
2021 4,002
2022 2,679
2023 and thereafter $ 3,562