Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 Reporting_Unit	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Aggregate amount of goodwill acquired	$ 149,600,000
Aggregate amount of impairment	17,100,000
Number of reporting units where fair value of goodwill exceed carrying value	1
Assessment of qualitative factors of goodwill	As a result of the assessment of these qualitative factors, with the exception of one reporting unit, the Company has concluded that it is more likely than not that the fair values of the reporting units with goodwill as of December 31, 2013 exceed the carrying values of these units.
Estimated fair value of goodwill exceeds from its carrying value	12.00%
Goodwill	132,220,000	19,548,000	14,661,000
Amortization expense of finite life intangible assets	4,700,000	300,000
Amortization expense of finite life intangibles for 2014	7,100,000
Amortization expense of finite life intangibles for 2015	7,100,000
Amortization expense of finite life intangibles for 2016	6,100,000
Amortization expense of finite life intangibles for 2017	5,200,000
Amortization expense of finite life intangibles for 2018	4,000,000
Reporting Unit One [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 4,800,000