Segments - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Revenues, net	$ 417,905,000	$ 404,605,000	$ 832,167,000	$ 820,771,000
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues, net			$ 0