Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Net intangible assets	$ 98,084	$ 108,593
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	123,013	125,448
Accumulated amortization	(27,513)	(19,773)
Net intangible assets	95,500	105,675
Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	2,574	3,405
Accumulated amortization	10	(487)
Net intangible assets	$ 2,584	$ 2,918