Goodwill and Intangible Assets - Net Intangible Assets Other Than Goodwill (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets with finite lives, Gross carrying amount	$ 734,332	$ 718,942
Intangible assets with finite lives, Accumulated amortization	(34,293)	(28,801)
Intangible assets with finite lives, Net carrying amount	700,039	690,141
Customer-related and other [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets with finite lives, Gross carrying amount	168,670	158,302
Intangible assets with finite lives, Accumulated amortization	(31,589)	(26,677)
Intangible assets with finite lives, Net carrying amount	137,081	131,625
Supplier relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets with finite lives, Gross carrying amount	12,000	12,000
Intangible assets with finite lives, Accumulated amortization	(1,440)	(960)
Intangible assets with finite lives, Net carrying amount	10,560	11,040
Non-compete agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets with finite lives, Gross carrying amount	660	600
Intangible assets with finite lives, Accumulated amortization	(300)	(200)
Intangible assets with finite lives, Net carrying amount	360	400
Trademarks [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets with finite lives, Gross carrying amount	968	968
Intangible assets with finite lives, Accumulated amortization	(964)	(964)
Intangible assets with finite lives, Net carrying amount	4	4
Trademarks [Member]
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Intangible assets with indefinite lives, Net carrying amount	$ 552,034	$ 547,072