Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Schedule of Revenue Disaggregated by Line of Business

The following table presents the Company’s revenues disaggregated by line of business (in thousands):

	Years Ended December 31,
	2018		2017		2016
Accountemps	$	1,915,054	$	1,765,666	$	1,786,276
OfficeTeam	1,063,238		984,873		972,414
Robert Half Technology	682,889		629,278		659,844
Robert Half Management Resources	669,385		631,225		608,243
Temporary and consulting staffing	4,330,566		4,011,042		4,026,777
Permanent placement staffing	511,989		439,214		419,314
Risk consulting and internal audit services	957,716		816,533		804,308
Net service revenues	$	5,800,271	$	5,266,789	$	5,250,399

Schedule of Contract Liability Activity

The following table sets forth the activity in contract liabilities from January 1, 2018 through December 31, 2018 (in thousands):

	December 31,
	2018
Balance at beginning of period	$	9,003
Payments in advance of satisfaction of performance obligations	12,170
Revenue recognized	(10,542		)
Other, including translation adjustments	2,366
Balance at end of period	$	12,997