Goodwill and Intangible Assets - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Reporting_Unit	Jul. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Goodwill [Line Items]
Number of reporting units | Reporting_Unit	5
Number of reporting units, fair value in excess of carrying value | Reporting_Unit	4
Goodwill	$ 195,733		$ 193,831	$ 199,802
Qelp [Member]
Goodwill [Line Items]
Acquisition date	Jul. 02, 2015
Purchase price of acquisition, carrying value		$ 15,600
Goodwill		$ 9,900
Goodwill Impairment Loss	$ 0