Acquisition - Summary of Acquired Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Acquired Intangible Assets [Line Items]
Costs	$ 13,255
Tradename- Indefinite Life [Member]
Acquired Intangible Assets [Line Items]
Costs	1,820
Other [Member]
Acquired Intangible Assets [Line Items]
Costs	300
Customer Relationships [Member]
Acquired Intangible Assets [Line Items]
Costs	5,455
Internally Developed Software [Member]
Acquired Intangible Assets [Line Items]
Costs	5,000
Useful Lives	3 years
Tradenames - Finite Life [Member]
Acquired Intangible Assets [Line Items]
Costs	300
Useful Lives	3 years
Non-Competition Agreements [Member]
Acquired Intangible Assets [Line Items]
Costs	$ 380
Useful Lives	3 years
Minimum [Member]
Acquired Intangible Assets [Line Items]
Useful Lives	3 years
Minimum [Member] | Customer Relationships [Member]
Acquired Intangible Assets [Line Items]
Useful Lives	10 years
Maximum [Member]
Acquired Intangible Assets [Line Items]
Useful Lives	15 years
Maximum [Member] | Customer Relationships [Member]
Acquired Intangible Assets [Line Items]
Useful Lives	15 years