Commitments and Contingencies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) Customer	Dec. 31, 2015 USD ($) Customer	Dec. 31, 2014 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Lease expense	$ 4,200,000	$ 4,500,000	$ 4,100,000
Unconditional purchase commitments	30,900,000
Unconditional purchase commitments, 2017	29,100,000
Unconditional purchase commitments, 2018	$ 1,800,000
Number of customer accounted on accounts receivable balance | Customer	1
Number of customers accounted for 10% or more of accounts receivable | Customer	0	0
Minimum
Commitments And Contingencies Disclosure [Line Items]
Lease agreement expiration year	2017
Maximum
Commitments And Contingencies Disclosure [Line Items]
Lease agreement expiration year	2019
Unconditional purchase commitments, 2019 and 2020	$ 100,000
Land | Maximum
Commitments And Contingencies Disclosure [Line Items]
Lease agreement expiration year	2078