Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Net intangible assets	$ 102,122	$ 108,593
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	121,783	125,448
Accumulated amortization	(22,117)	(19,773)
Net intangible assets	99,666	105,675
Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	2,565	3,405
Accumulated amortization	(109)	(487)
Net intangible assets	$ 2,456	$ 2,918