Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies - Significant Changes in Our Contract Liabilities (Detail)

v3.10.0.1
Basis of Presentation and Significant Accounting Policies - Significant Changes in Our Contract Liabilities (Detail)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
Change in Contract with Customer, Liability [Abstract]  
Short Term, Balance, beginning of period $ 12,763
Short Term, Revenue recognized during the period that was included in the beginning balance of contract liabilities (6,864)
Short Term, Additional amounts recognized during the period 16,448
Short Term, Revenue recognized during the period that was recorded during the period (10,971)
Short Term, Transfers 972
Short Term, Balance, end of period 12,348
Short Term, Amount refundable at beginning of period 12,450
Short Term, Amount refundable at end of period 12,221
Long-Term, Balance, beginning of period 1,951
Long-Term, Revenue recognized during the period that was included in the beginning balance of contract liabilities 0
Long-Term, Additional amounts recognized during the period 574
Long-Term, Revenue recognized during the period that was recorded during the period 0
Long-Term, Transfers (972)
Long-Term, Balance, end of period 1,553
Long-Term, Amount refundable at beginning of period 1,677
Long-Term, Amount refundable at end of period $ 1,553