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Other Intangible Assets (Schedule of Other Intangible Assets) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Intangible Assets Net Excluding Goodwill [Abstract]    
Customer relationships $ 114,885 $ 114,603
Noncompete agreements 14,474 14,402
Trademarks 10,764 10,753
Internal-use software licenses 24,510 29,394
Patents 2,840 2,840
Finite-lived intangible assets, gross 167,473 171,992
Accumulated amortization (81,829) (79,535)
Finite-lived intangible assets, net 85,644 92,457
Licenses 16,915 16,915
Other intangibles assets, net $ 102,559 $ 109,372