Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Net intangible assets	$ 100,904	$ 108,593
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	123,222	125,448
Accumulated amortization	(24,905)	(19,773)
Net intangible assets	98,317	105,675
Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	2,695	3,405
Accumulated amortization	(108)	(487)
Net intangible assets	$ 2,587	$ 2,918