Reportable Segments - Operations of Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Net service revenues	$ 313,810	$ 279,956	$ 898,592	$ 791,667
Gross profit	98,291	91,055	276,203	255,005
Flexible Billings [Member]
Segment Reporting Information [Line Items]
Net service revenues	301,310	267,806	863,812	754,801
Search Fees [Member]
Segment Reporting Information [Line Items]
Net service revenues	12,500	12,150	34,780	36,866
Tech [Member]
Segment Reporting Information [Line Items]
Net service revenues	217,643	193,582	625,315	541,786
Gross profit	63,591	58,287	180,210	161,181
Tech [Member] | Flexible Billings [Member]
Segment Reporting Information [Line Items]
Net service revenues	212,269	188,888	610,897	526,941
Tech [Member] | Search Fees [Member]
Segment Reporting Information [Line Items]
Net service revenues	5,374	4,694	14,418	14,845
FA [Member]
Segment Reporting Information [Line Items]
Net service revenues	71,380	62,247	201,773	179,627
Gross profit	26,425	24,064	73,793	69,607
FA [Member] | Flexible Billings [Member]
Segment Reporting Information [Line Items]
Net service revenues	64,254	54,791	181,411	157,606
FA [Member] | Search Fees [Member]
Segment Reporting Information [Line Items]
Net service revenues	7,126	7,456	20,362	22,021
GS [Member]
Segment Reporting Information [Line Items]
Net service revenues	24,787	24,127	71,504	70,254
Gross profit	8,275	8,704	22,200	24,217
GS [Member] | Flexible Billings [Member]
Segment Reporting Information [Line Items]
Net service revenues	$ 24,787	$ 24,127	$ 71,504	$ 70,254