Goodwill, Acquistion-Related Intangible Assets, and Other Long Lived Assets - Additional Information (Detail) (USD $)	12 Months Ended	6 Months Ended
	Dec. 31, 2013	Jun. 30, 2014 Minimum [Member] Acquired customer relationships [Member] Acquisitions Prior to 2011 [Member]	Jun. 30, 2014 Minimum [Member] Acquired customer relationships [Member] PRI, VSI, E5 and Darwin [Member]	Jun. 30, 2014 Minimum [Member] Acquired customer contracts [Member] Acquisitions Prior to 2011 [Member]	Jun. 30, 2014 Minimum [Member] Acquired technology [Member] Acquisitions Prior to 2011 [Member]	Jun. 30, 2014 Minimum [Member] Acquired technology [Member] PRI, VSI, E5 and Darwin [Member]	Jun. 30, 2014 Minimum [Member] Non-compete agreements [Member] PRI, VSI, E5 and Darwin [Member]	Jun. 30, 2014 Minimum [Member] Acquired trademarks [Member] PRI, VSI, E5 and Darwin [Member]	Jun. 30, 2014 Maximum [Member] Acquired customer relationships [Member] Acquisitions Prior to 2011 [Member]	Jun. 30, 2014 Maximum [Member] Acquired customer relationships [Member] PRI, VSI, E5 and Darwin [Member]	Jun. 30, 2014 Maximum [Member] Acquired customer contracts [Member] Acquisitions Prior to 2011 [Member]	Jun. 30, 2014 Maximum [Member] Acquired technology [Member] Acquisitions Prior to 2011 [Member]	Jun. 30, 2014 Maximum [Member] Acquired technology [Member] PRI, VSI, E5 and Darwin [Member]	Jun. 30, 2014 Maximum [Member] Non-compete agreements [Member] PRI, VSI, E5 and Darwin [Member]	Jun. 30, 2014 Maximum [Member] Acquired trademarks [Member] PRI, VSI, E5 and Darwin [Member]
Finite-Lived Intangible Assets [Line Items]
Recorded impairment charges	$ 0
Estimated useful life of intangible assets		3 years	2 years	3 years	1 year	5 years	1 year	1 year	12 years	12 years	5 years	4 years	10 years	5 years	2 years