Supplemental Consolidated Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2017

Balance Sheet Related Disclosures [Abstract]

Components of Accounts Receivable, Net

	December 31,			December 31,
	2017			2016
Billed amounts	$	194,694		$	183,656
Engagements in process		102,026			100,779
Allowance for uncollectible billed amounts		(18,274	)		(14,967	)
Allowance for uncollectible engagements in process		(10,605	)		(7,713	)
Accounts receivable, net	$	267,841		$	261,755

Components of Prepaid Expenses and Other Current Assets

	December 31,		December 31,
	2017		2016
Notes receivable - current	$	3,047	$	2,636
Prepaid recruiting and retention incentives - current		8,705		9,173
Other prepaid expenses and other current assets		21,169		17,953
Prepaid expenses and other current assets	$	32,921	$	29,762

Components of Other Assets

	December 31,		December 31,
	2017		2016
Notes receivable - non-current	$	6,260	$	2,943
Capitalized client-facing assets		1,803		1,733
Prepaid recruiting and retention incentives - non-current		8,611		11,116
Prepaid expenses and other non-current assets		6,870		2,490
Other assets	$	23,544	$	18,282

Property and Equipment, Net

	December 31,			December 31,
	2017			2016
Furniture, fixtures and equipment	$	72,776		$	69,210
Software		93,883			83,766
Leasehold improvements		57,689			57,128
Property and equipment, at cost		224,348			210,104
Less: accumulated depreciation and amortization		(135,179	)		(127,151	)
Property and equipment, net	$	89,169		$	82,953

Components of Other Current Liabilities

	December 31,		December 31,
	2017		2016
Deferred acquisition liabilities - current	$	3,897	$	10,780
Deferred revenue		27,979		21,258
Deferred rent - current		3,341		2,894
Other current liabilities		3,678		3,684
Total other current liabilities	$	38,895	$	38,616

Components of Other Non-Current Liabilities

	December 31,		December 31,
	2017		2016
Deferred acquisition liabilities - non-current	$	1,972	$	943
Deferred rent - non-current		28,534		19,776
Other non-current liabilities		1,668		11,860
Total other non-current liabilities	$	32,174	$	32,579