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Other Intangible Assets (Schedule of Other Intangible Assets) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Intangible Assets Net Excluding Goodwill [Abstract]    
Customer relationships $ 77,600 $ 78,542
Noncompete agreements 10,210 10,007
Trademarks 7,210 6,472
Internal-use software licenses 27,632 16,038
Patents 2,840 2,840
Finite-lived intangible assets, gross 125,492 113,899
Accumulated amortization (67,250) (51,885)
Finite-lived intangible assets, net 58,242 62,014
Licenses 16,884 16,884
Other intangibles assets, net $ 75,126 $ 78,898