Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	May. 29, 2015
Intangible Assets [Line Items]
Intangible assets subject to acquisition	$ 57,226
Amortization of intangible assets	4,090
Amortization expense	2,013
Accumulated amortization	4,297
Caprock [Member]
Intangible Assets [Line Items]
Intangible assets subject to acquisition	2,490	$ 2,490
Amortization of intangible assets	203
Amortization expense	22
Customer Relationship [Member] | Caprock [Member]
Intangible Assets [Line Items]
Intangible assets subject to acquisition	$ 2,430
Preliminary estimated intangible assets useful life	12 years
Trade Name [Member] | Caprock [Member]
Intangible Assets [Line Items]
Intangible assets subject to acquisition	$ 60
Preliminary estimated intangible assets useful life	1 year