Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following tables present revenues, gross profit, operating income and amortization by reportable segment (in thousands):

	Three Months Ended									Three Months Ended
	June 30, 2015									June 30, 2014
	Apex		Oxford		Corporate			Total		Apex		Oxford		Corporate			Total
Revenues	$	338,704	$	146,619	$	—		$	485,323	$	297,893	$	136,531	$	—		$	434,424
Gross profit	97,652		60,882		—			158,534		84,677		57,228		—			141,905
Operating income	34,228		18,830		(20,348		)	32,710		31,708		19,028		(13,967		)	36,769
Amortization	5,384		1,573		—			6,957		4,089		1,433		—			5,522

	Six Months Ended									Six Months Ended
	June 30, 2015									June 30, 2014
	Apex		Oxford		Corporate			Total		Apex		Oxford		Corporate			Total
Revenues	$	632,997	$	282,371	$	—		$	915,368	$	576,301	$	264,974	$	—		$	841,275
Gross profit	177,295		117,114		—			294,409		160,183		109,877		—			270,060
Operating income	57,139		34,575		(33,933		)	57,781		54,492		34,633		(25,848		)	63,277
Amortization	8,906		2,920		—			11,826		8,178		2,874		8			11,060

Schedule of Revenue by Geographical Areas

The Company operates internationally, with operations mainly in the United States, Europe, and Canada. The following table represents revenues by geographic location (in thousands):

	Three Months Ended								Six Months Ended
	June 30,								June 30,
	2015		%		2014		%		2015		%		2014		%
Revenues:
Domestic	$	462,989	95.4	%	$	414,624	95.4	%	$	873,745	95.5	%	$	801,577	95.3	%
Foreign	22,334		4.6	%	19,800		4.6	%	41,623		4.5	%	39,698		4.7	%
	$	485,323	100.0	%	$	434,424	100.0	%	$	915,368	100.0	%	$	841,275	100.0	%