Goodwill and Other Intangible Assets (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Other Intangible Assets [Line Items]
Goodwill impairment	$ 81,877		$ 81,877
Amortization expense of intangible assets	$ 2,200	$ 2,100	$ 6,700	$ 6,400
Customer relationships
Goodwill and Other Intangible Assets [Line Items]
Amortization period of intangible assets, in years			15 years
Non-compete agreements
Goodwill and Other Intangible Assets [Line Items]
Amortization period of intangible assets, in years			5 years
Other intangible assets
Goodwill and Other Intangible Assets [Line Items]
Amortization period of intangible assets, in years			15 years